moodlite

moodlite => moodlite Design => Topic started by: 51055 on December 29, 2018, 12:46:35 PM

Title: Better diffusion
Post by: 51055 on December 29, 2018, 12:46:35 PM
I'm planning to make a set of these, but am looking to improve the diffusion so the lights are less concentrated at the corners. Has anyone tried any variations on the design to do this?

I'll try lining the back with reflective film to see what that does. I'll also try lining the front with some diffusion sheet I salvaged from a large flat LED panel. They have LEDs all around the outer edge but shine evenly over their whole surface so I'm optimistic. I just need to find a source of the stuff to make more than  lights.

My new 3d printer should arrive within the week so I'll post results when they're made.
Title: Re: Better diffusion
Post by: Bandanam4n on December 29, 2018, 03:52:42 PM
Hey Man!

I'm looking to modify the design to include a backer plate (opaque with reflective film) and then add in a diffuser plate (acryllic) on top of it to get a much better diffused light.

Take a look at that!
Title: Re: Better diffusion
Post by: iTrooper on January 01, 2019, 09:38:02 AM
I was thinking the same in regards to some sort of diffuser that could be laser cut.
Title: Re: Better diffusion
Post by: shfaxx on January 02, 2019, 12:10:08 AM
Hey Man!

I'm looking to modify the design to include a backer plate (opaque with reflective film) and then add in a diffuser plate (acryllic) on top of it to get a much better diffused light.

Take a look at that!

Was thinking of using something like this on the side of the baseplate to reflect the light back up.   
https://www.amazon.com/dp/B07D54XMVS/ref=cm_wl_huc_continue
Title: Re: Better diffusion
Post by: shfaxx on January 03, 2019, 08:46:18 PM
Printed a "Top" in "Clear" PETg to see how it looks.

PS - Parts on order, will post results in a few days when I get everything in.
Title: Re: Better diffusion
Post by: LordVader on January 03, 2019, 08:50:37 PM
This may be a little bit too translucent. Maybe you'll see the cables when using this.
But I am curious a about the look with that as well :-D
Title: Re: Better diffusion
Post by: shfaxx on January 03, 2019, 09:35:48 PM
Had another Brainiac idea.  Hopefully someone can CAD it up properly and we can test (My CAD skills blow).     I was looking at the original build of the NanoLeaf, they use a lightguide technique where they drive the light into a medium in the middle of the panel which glows.  I was thinking we could try something similar with the top panel.  If we were to basically print something directly in front of the LEDs which is attached to the top panel, hopefully it would help drive the light into the front panel and give more of a uniform glow.  I mocked up something crude in tinkercad.  This is just to give you an idea of what I was thinking, the bumps would have to be right in front of the LEDs to work best I think.    One concern there would be, how hot to the LEDs get, do we need to worry about that?
Title: Re: Better diffusion
Post by: shfaxx on January 03, 2019, 09:38:03 PM
This may be a little bit too translucent. Maybe you'll see the cables when using this.
But I am curious a about the look with that as well :-D

Yeah kinda thought the same, but still wanted to see how it looked.   Once I get all the other parts I'll pop it on and see what we get.
Title: Re: Better diffusion
Post by: LordVader on January 03, 2019, 09:53:24 PM
I really like that you all add your ideas and try things.
This is going to be great :-D
Title: Re: Better diffusion
Post by: CdRsKuLL on January 03, 2019, 11:02:46 PM
I've ordered some clear filament as I was thinking something similar. :-) should be here tomorrow I hope. Will cad it up tomorrow night.


Steve
Title: Re: Better diffusion
Post by: shfaxx on January 05, 2019, 09:15:13 PM
After putting one of these completely together, it seems the "pyramid" shape in the middle may be causing the light to drop off.  Would be interested to see if the bottom could be made completely flat.  I'm guessing it would require almost doubling the depth of the bottom piece but it may make for better light diffusion.    If someone can CAD it up, I'm happy to print and give it a try.
Title: Re: Better diffusion
Post by: LordVader on January 05, 2019, 09:30:35 PM
Why do you think that it would double the bottom part?
I could remove the pyramid partfor testing.
Title: Re: Better diffusion
Post by: LordVader on January 05, 2019, 09:51:31 PM
Okay, now I get your point :D

(https://abload.de/img/abc57fwq.png)

Perhaps does CdRsKuLL has a version without the pyramid. Otherwise I will go on with changing the part.
Title: Re: Better diffusion
Post by: shfaxx on January 05, 2019, 10:01:08 PM
Okay, now I get your point :D

Perhaps does CdRsKuLL has a version without the pyramid. Otherwise I will go on with changing the part.

LOL, yeah all the wire management is hidden under the pyramid and those servo connectors are pretty thick.  It will surely add material and print time but if it looks better, I'm all for it.   Figure we should at least test it out and see.

Maybe I will do just that.  Since I'm just testing, I'll mod it in tinkercad and rip all the guts out and print a flat bottom.  I don't have any of the connectors are this point anyway, so just for a lighting test this would work.   Will post my results in a 5-6 hours..
Title: Re: Better diffusion
Post by: shfaxx on January 06, 2019, 03:35:19 AM
Did a quick a dirty model with a flat bottom.   The pictures really don't do it justice.  It does appear to help even out the glow across the entire panel.

NOTE:  I put tape over the tips to cool down the hotspots from the LEDs so my phone camera didn't freak out trying to adjust the exposure..   To that point would prob be good to extend the small covers in the top plate a few more mm.
Title: Re: Better diffusion
Post by: shfaxx on January 06, 2019, 05:02:42 AM
Printed another white top to do a side by side comparison.  Again it's not as apparent in the pix, but the flat bottom gives a better uniformity to the panel.

Left = Standard bottom
Right = Flat bottom
Title: Re: Better diffusion
Post by: CdRsKuLL on January 06, 2019, 09:33:23 AM
I did design it with a flat bottom to start with but struggled with the wiring. Are you using the V2 bottom as a comparison?


Thanks,
Title: Re: Better diffusion
Post by: shfaxx on January 06, 2019, 01:15:20 PM
I did design it with a flat bottom to start with but struggled with the wiring. Are you using the V2 bottom as a comparison?


Thanks,
Yes the comparison is only using the v2 Base.  I was thinking a bit about how we could make a flat bottom. Couple options:

1 - Simply drop all the wire routing down under the flat bottom.  This will make the entire tile a little thicker.
1.1 - In order to keep the thickness down, would a different smaller connector be better?  Something like this maybe?
     https://www.amazon.com/HKBAYI-50Pair-50sets-Connector-WS2812B/dp/B00NBSH4CA
2 - Instead of hiding the wiring under the tile, would it be possible to keep it all inside around the edges?
Title: Re: Better diffusion
Post by: AgileNebula on January 06, 2019, 02:16:06 PM
I did design it with a flat bottom to start with but struggled with the wiring. Are you using the V2 bottom as a comparison?


Thanks,
Yes the comparison is only using the v2 Base.  I was thinking a bit about how we could make a flat bottom. Couple options:

1 - Simply drop all the wire routing down under the flat bottom.  This will make the entire tile a little thicker.
1.1 - In order to keep the thickness down, would a different smaller connector be better?  Something like this maybe?
     https://www.amazon.com/HKBAYI-50Pair-50sets-Connector-WS2812B/dp/B00NBSH4CA
2 - Instead of hiding the wiring under the tile, would it be possible to keep it all inside around the edges?

I have been looking at this problem as well.  I think your proposed solution 1 or 2 is the best option.  The connectors in 1.1 are actually larger than the servo connectors because of the latch.  This would also make separating the tiles difficult. 

For option 1, the tiles are a little thinner than the power module, I suspect if you increase the height to be the same you could find enough space underneath to run the wires.

I am going to initially try option 2 as it means not having to print a new bottom tile. 
Title: Re: Better diffusion
Post by: shfaxx on January 06, 2019, 02:33:24 PM

I have been looking at this problem as well.  I think your proposed solution 1 or 2 is the best option.  The connectors in 1.1 are actually larger than the servo connectors because of the latch.  This would also make separating the tiles difficult. 

For option 1, the tiles are a little thinner than the power module, I suspect if you increase the height to be the same you could find enough space underneath to run the wires.

I am going to initially try option 2 as it means not having to print a new bottom tile.
Ahhh ok yeah I don't have ANY of the connectors at this point to gauge how large/small anything is, def good point about the clips too...   

Curious to see how you make out with option 2!

Dunno if these would be any better / smaller:
https://www.amazon.com/Micro-Connector-150mm-Female-daier/dp/B01DUC1PW6/ref=sr_1_3_a_it?ie=UTF8&qid=1546785421&sr=8-3&keywords=micro+3+pin+connector
Title: Re: Better diffusion
Post by: shfaxx on January 07, 2019, 02:41:25 AM
Did a flat bottom panel with 6 LEDs.  While it def helps fill the panel, the hotspots are kinda distracting.  Off to go test the double LEDs in the corners.

Title: Re: Better diffusion
Post by: shfaxx on January 07, 2019, 03:01:55 AM
Playing around trying to get rid of those hotspots.  While this may not be very practical, if you separate the front and bottom plates by about 1/2", it cools things down quite a bit.

EDIT:  Check my build log, I've updated the top panel to be the same thickness as the power box which has helped the diffusion.
Title: Re: Better diffusion
Post by: Stevewii on January 13, 2019, 09:22:12 PM
Have you guys look at this https://www.eevblog.com/forum/projects/nanoleaf-aurora-teardown/

It looks they are using a flat backplane with 6 leds (or 12 if you count the white ones also) instead of 1..
Perhaps thats the solution?
Title: Re: Better diffusion
Post by: shfaxx on January 13, 2019, 09:41:17 PM
Have you guys look at this https://www.eevblog.com/forum/projects/nanoleaf-aurora-teardown/

It looks they are using a flat backplane with 6 leds (or 12 if you count the white ones also) instead of 1..
Perhaps thats the solution?

Yeah I saw it, it appears they are edge lighting a piece of plexi sandwiched in between the panel with 12 LEDs per corner (36 per panel).     I've looked up some ways to do edge lighting.  You have to have the plexi edge basically touching the LEDs.  The edge needs to be polished smooth / clear (You can supposedly torch it clear).
I was thinking of getting a piece of plexi to test with.  Was going to sand the entire surface and cut it so it lays INSIDE our moodlite panel (Laying on top the pyramid).  Then put the standard top over it.    Seems like a huge PITA since I don't have a laser cutter, etc.   Maybe some day I'll give it a go, or if someone here has some of this available.
Title: Re: Better diffusion
Post by: AgileNebula on January 13, 2019, 09:45:13 PM
I have been looking at this, I think the number of leds helps but the real trick, as shfaxx mentioned, is the acrylic panel w/ holes in the middle.  By edge lighting the piece of acrylic each time the light hit one of the holes it scatters.  The causes the entire piece of acrylic to illuminate.  In conjunction with the diffusion film on top this results in the very even lighting. 

I tested this with a thin piece of acrylic I had lying around and the effect does work.  It is just very time consuming to do.
Here are some pictures showing what I mean.  This is with just 1 led in each corner.

This is my acrylic panel installed, note the position of the holes near the center.
(https://i.imgur.com/bq4ffrxl.jpg)

Here it is illuminated.  Again, note that those holes are easily visible.  It definitely works but would be a pain to reproduce.
(https://i.imgur.com/wse6i9El.jpg)

To do this right, you would need a thicker piece of acrylic than the one I used.
Title: Re: Better diffusion
Post by: shfaxx on January 13, 2019, 09:49:22 PM
Instead of holes, would be interested to see if you just sanded the entire piece of acrylic.  Also more LEDs always better. :)
Title: Re: Better diffusion
Post by: AgileNebula on January 13, 2019, 10:02:47 PM
Top tile - sanded piece of acrylic.
Bottom tiles - normal v2 w/o acrylic.

(https://i.imgur.com/PYmWcztl.jpg)

There seems to be no difference to me between the sanded acrylic and the standard tile.  Maybe there would be a bigger difference with more leds but I am not so sure.  To me, the hole pattern seems to make a more noticeable difference.
Title: Re: Better diffusion
Post by: shfaxx on January 13, 2019, 10:07:50 PM
Wow, yeah don't see much dif from the pix strange.  Def agree that different colors / patterns seems to look better.   The best diffusion I've found so far is just to lift the front plate a few mm.   Ahh well, back to printing. :)

ps - These things are tough to photograph aren't they...
Title: Re: Better diffusion
Post by: NotionalLabs on January 14, 2019, 05:21:59 PM
The approach Shfaxx and AgileNebula raised is the one I'm pursuing in my experiments too; the acrylic sheet is called a Light Guide Panel and the design of these usually takes a fair bit of engineering. From my research and testing there are a number of design elements you need to make an LGP that provides totally even lighting. but generally speaking I believe you can fabricate one with a laser engraver that should be accessible to most hackerspaces or sign shops.

The trick is to balance and compensate for the attenuation of the light as it bounces around in the acrylic, and maximizing the light emitted into the diffuser layer for brightness. If you sand the whole panel, you're still likely going to get bright spots near the corners as the LGP "diffusion spots" will be spread evenly across it's surface. This also means there's less light to bounce around in the LGP as it's been scattered near the already hot-corners.

I'm experimenting with modeling some mathematically derived patterns that can be easily raster-etched using a laser cutter, but in the meantime if you have some spare acrylic, perhaps you could try sanding it in a Y-shape corresponding to the dark spots in the centre and sides of the panel. Flame-polishing the edges will help reduce insertion loss too.

Jim
Title: Re: Better diffusion
Post by: AgileNebula on January 14, 2019, 09:14:18 PM
I had just enough acrylic left to make one more panel.  I taped off the corners and sanded the middle portion of the tile.  You can definitely notice a difference but it is mainly right at the point where the sanding starts.  Ideally the piece of acrylic would be the same height as the led, the piece I had was only 1.5mm thick vs 5mm for the leds.  I am trying to find a small piece of thicker acrylic to test with.

(https://i.imgur.com/x7HPpxSl.jpg)(https://i.imgur.com/Cq5tWn1l.jpg)

Title: Re: Better diffusion
Post by: CdRsKuLL on January 14, 2019, 09:34:37 PM
Very nice.. that's looking better I think.  You inspired me to try something out. I've got some clear PLA so quickly designed up a diffuser, 20% infill 3mm thick, will see how it goes. Will let you know how it goes in the morning.


Steve




Title: Re: Better diffusion
Post by: shfaxx on January 14, 2019, 09:47:13 PM
Very nice.. that's looking better I think.  You inspired me to try something out. I've got some clear PLA so quickly designed up a diffuser, 20% infill 3mm thick, will see how it goes. Will let you know how it goes in the morning.


Steve
Interested to see how this goes.  I know the “clear” top doesn’t help.  Not sure how much light will pass through the filament but def worth a try.
Title: Re: Better diffusion
Post by: AgileNebula on January 14, 2019, 11:02:01 PM
I am also interested to see how it goes.  I actually have a spool of clear sitting here as I was going to try the same thing.  Most of the settings I see for printing clear objects use 100% infill, so I am interested to see how 20% work and if it helps with diffusion.  The print time on a 100% infill was over 10 hours which caused me to hesitate trying it.

I also modified the tile bottom to have a flat bottom that is at exactly the height of the leds on my strip.  This should make aligning the panel with the led easier and guarantee that as much light as possible from the led is being directed into the panel.   Unfortunately I have run out of white but I am going to print one out using a random color to test the dimensions.  It should work as long as your strip is close to the dimensions of mine (5mm led - 2.5mm above & below).  The overall tile height is actually 2.5mm taller than the v2 tile, this is where I made a mistake with the first version.

(https://i.imgur.com/kZdGfpnl.png)
 
Note: Fixed the issue with the first version.  Updated the attachment with the changes. 
Title: Re: Better diffusion
Post by: digitalgecko on January 15, 2019, 12:26:34 AM
I have printed a cover in hatchbox clear pla. It looks okish. Kinda like those replacement cellphone cases from the 00's. With a top and bottom thickness of 0.8mm you will have no infill in the main 'lens' part of the cover. Unfortunately I didsome destructive testing and can't take a picture of the final product.
Title: Re: Better diffusion
Post by: shfaxx on January 15, 2019, 02:05:18 AM
I have printed a cover in hatchbox clear pla. It looks okish. Kinda like those replacement cellphone cases from the 00's. With a top and bottom thickness of 0.8mm you will have no infill in the main 'lens' part of the cover. Unfortunately I didsome destructive testing and can't take a picture of the final product.

I also printed a top in clear PETg, but as you indicated the results aren't very good.  The standard while PLA is way better, it goves off more of a glow.
Title: Re: Better diffusion
Post by: AgileNebula on January 16, 2019, 01:14:28 PM
I ran a few test prints with some clear PLA, so far the results are not that good.  I think it will be very difficult to print anything remotely clear enough to work for the light guide panel.  I am going to try sourcing a thicker piece of acrylic and try a few different patterns to see what kind of effect I can get.

Also, if you grabbed the STL I posted earlier, you will want to download the new version.  There was a issue with the pocket for the leds not being deep enough, I have corrected the issue.
Title: Re: Better diffusion
Post by: Allistar on January 17, 2019, 02:36:10 AM
Hey, all!  I did a build of 5 panels so far.  Has anyone considered reflective mylar film for the bottom panel, maybe in the middle quadrant?

Title: Re: Better diffusion
Post by: shfaxx on January 17, 2019, 02:55:29 AM
Hey, all!  I did a build of 5 panels so far.  Has anyone considered reflective mylar film for the bottom panel, maybe in the middle quadrant?
I tried putting down some reflective metal tape.  It didn’t hep at all. The white bottom does a better job of glowing
Title: Re: Better diffusion
Post by: NotionalLabs on January 17, 2019, 09:17:07 AM
I've made some progress on designing a laser engrave-able light guide panel for the Moodlite, but unfortunately the Epilog Fusion M2 at work is in need of some TLC so I'm not sure when I'll be able to test the design out IRL.

In any case, here's a quick preview of the pattern I'm testing (in jpg - the high-res BMP for raster etching and a vector cut template is in the zip here in case someone wants to give it a go: https://drive.google.com/open?id=1O2me9Px5z1d3e3BTszjvPhCq_1TRewBQ (https://drive.google.com/open?id=1O2me9Px5z1d3e3BTszjvPhCq_1TRewBQ)):

(https://i.imgur.com/59pMQuC.jpg?2)

I'm going to try straight etching this pattern, then a second with a circular gradient "3D etching" mask to achieve deeper dots in the centre of the panel (the theory being that deeper holes will capture and scatter more light, helping compensate more for the light drop-off in the furthest areas from the LEDs). I may have to iterate on the overall density, density distribution/gradient, and dot size before getting an even illumination across the panel. With the laser settings dialled in correctly, the edges should come out nicely "flame polished" so insertion loss is minimised.

Another thing I'm curious about testing is seeing if coating the back and long sides of the light guide with mirror reflector paint (www.amazon.co.uk/Rust-Oleum-AE0484150UK-Spray-Paint-Silver/dp/B01HQ9T4C2/ (http://www.amazon.co.uk/Rust-Oleum-AE0484150UK-Spray-Paint-Silver/dp/B01HQ9T4C2/)) increases the useful light emission. It could end up being a mess, in which case I'll fall back on using a thin piece of styrene or white gloss card to act as the backing reflector.

@AgileNebula - if you end up getting some more acrylic before I get a chance to test my pattern, I'd love to see what a circular sanding pattern that mimics this density gradient would look like. If it ends up being acceptable, it'd probably be a much more accessible solution for folks if they haven't got a laser engraver within reach.
Title: Re: Better diffusion
Post by: Kasalop on January 17, 2019, 07:05:13 PM
Perhaps it's a stupid idea, but has anybody took a look at One Way Mirror Film / Foil on a transparent top cover?? This could lead to a higher reflextion rate in darker spots (YT ment I should take a look at infinity mirrors, that's where this idea come from).

EDIT: If I think about it... perhaps it leads to the complete opposite of what you're trying to achive. It's diffucult.
Title: Re: Better diffusion
Post by: Stevewii on January 17, 2019, 07:46:51 PM
What is so different in the moodlite design when looking at the nanoleaf setup? They use a flat bottom pannel just like us. The only thing is that they use three layers on top.
Title: Re: Better diffusion
Post by: NotionalLabs on January 17, 2019, 08:11:43 PM
What is so different in the moodlite design when looking at the nanoleaf setup? They use a flat bottom pannel just like us. The only thing is that they use three layers on top.

They use a professionally engineered and manufactured light guide panel and rear reflector arrangement. This is a pretty standard design for LED lighting panels and usually they are custom designed for the application.

I haven't seen the Nanoleaf light guide panel up close, but I took apart a spare edge-lit LED ceiling panel I had lying around and it's LGP was super sophisticated:

Side view:
(https://i.imgur.com/5Ax0WhW.jpg)

Very close up:
(https://i.imgur.com/scRRwJV.jpg)

My guess is this a prism panel with multilayered sub-surface laser engraved dots - far beyond our ability to print or fabricate with DIY tools I think. It did cross my mind that you can get these ceiling panels pretty cheap and you could possibly cut out quite a few moodlite panels from the LGP/reflector/diffuser layers. The cost would start seriously creeping up though.

Jim
Title: Re: Better diffusion
Post by: Stevewii on January 17, 2019, 08:26:20 PM
Thnx for the explanation!

What if we made the design smaller so that the light beams cross? Could that be a simpler solution? Or perhaps create a square version?
Title: Re: Better diffusion
Post by: SuperDave42 on January 20, 2019, 04:10:22 AM
The Nanoleaf laser dot pattern is even

https://moodlite.co.uk/index.php?topic=70.msg545#msg545

I'm going to try to make a sample on my laser.     The LED strips we use are soo much taller than the nanoleafs 3mm.. 

Title: Re: Better diffusion
Post by: NotionalLabs on January 20, 2019, 09:12:04 AM
Awesome photos, that really helps! The density-concentration approach I took is to mimick designs for LGPs I've found when researching how they are usually made, but I hadn't seen the Nanoleaf one up close until you posted it. Perhaps we don't need to compensate for the drop off so much if we're lighting it from 3 different angles at once.

Jim

Title: Re: Better diffusion
Post by: SuperDave42 on January 20, 2019, 05:07:42 PM
Awesome photos, that really helps! The density-concentration approach I took is to mimick designs for LGPs I've found when researching how they are usually made, but I hadn't seen the Nanoleaf one up close until you posted it. Perhaps we don't need to compensate for the drop off so much if we're lighting it from 3 different angles at once.

Jim

Seeing your density concentration pattern really intrigued me and is what motivated me to go out and buy the Nano to tear down for a better look.  Variable density is not needed when evenly lit from 3 sides facing into the center.

How did you create your pattern ?  I'm interested in that for other fun stuff.
Title: Re: Better diffusion
Post by: NotionalLabs on January 20, 2019, 05:57:53 PM
My pleasure, your super detailed teardown was fascinating - I appreciate you spending the time and money.

To create the pattern I wrote a small script in Python that uses the PIL (Pillow fork) library to generate the high-resolution 8-bit greyscale bitmap for raster engraving, and an output mask that I used to both mask off the final output dot pattern (like I posted further up) and save as a standalone image that I could use to generate the vector cutting path in Inkscape (via the "trace bitmap" feature). The pattern itself was generated by playing with a parabolic quadratic equation until I was happy with the shape of the curve, then using the output of that to give me the appropriate dot spacing for a given X and Y line. This gives a very regular spacing though, so I then calculate a random variable to offset the X & Y coordinates of the actual dot placement each time, which generates the more diffuse pattern that I posted. I thought this might be serviceable for a first try (especially since I haven't engraved an LGP before so I wasn't totally sure if it would produce much of an effect without professional tools or a lensing surface, etc), but one big issue is that the pattern still has a bias towards the cardinal "north/south" and "east/west" axis. That's not ideal for a triangular LGP with 3 opposing entry points, so I was about to rewrite the code using some trig to calculate the dot placements (more like a circular gradient approach) when I saw your post ;)

I'll give a regular pattern a go, your photos and description are perfect - if I get a workable script together I'll post it so you can hack it to whatever you have in mind.
Title: Re: Better diffusion
Post by: NotionalLabs on January 21, 2019, 07:39:24 PM
I managed to get on the laser today and I'm super impressed with the results! It's very hard to photograph in a way that's representative of what it looks like in person, but the diffusion with a regularly spaced LGP is significantly better:

(https://i.imgur.com/HJXt6JV.jpg)

Vs a stock Moodlite v2 without any LGP or changes (printed in white PLA, 20% infill):

(https://i.imgur.com/pAdcCCU.jpg)

The LGP is based off SuperDave42's teardown, with 0.5mm dots spaced 1mm apart, engraved at 55% power out of 3mm clear acrylic. I'll clean up my python code and the images used to create this and post them up here for folks to try if they have a laser engraver handy. Here's a photo of it in-place:

(https://i.imgur.com/hhrrgDc.jpg)

The photographs don't really do it justice, the difference is huge and the bright spots in the photos aren't anywhere near as pronounced in person. Here's a video of it in action: https://imgur.com/HFMMoxq

Jim
Title: Re: Better diffusion
Post by: SuperDave42 on January 21, 2019, 08:16:51 PM
AWESOME! looks a LOT better

I just picked up a sheet of this material during lunch today
It's similar to the top sheet in the NanoLeaf, just a shiner smooth top surface.

I also notice that other LGP makers use the Dot Matrix pattern as well as a Line Matrix pattern   (grids)    I suppose honeycomb matrix patterns etc could also be used.



Title: Re: Better diffusion
Post by: NotionalLabs on January 22, 2019, 12:12:09 AM
Hey all,

Here's the code and source images that I used to engrave the panels in my photos: https://drive.google.com/open?id=1EvXxb8voaSalf7lAFy04ohaIDxxQmt81 (https://drive.google.com/open?id=1EvXxb8voaSalf7lAFy04ohaIDxxQmt81)

(https://i.imgur.com/DVl97RB.png?1)

The pre-made pattern, mask, vector path, and the exact Adobe Illustrator file I used to create it are included, along with the Python3 code used to generate the images. I quickly annotated it in case it's helpful for anyone who wants to tweak the parameters of the LGP for their builds.

I briefly tested using some folded aluminium foil to black out the corners and it seems to improve the diffusion appearance a little by limiting the bleed through the 3d printed top:

(https://i.imgur.com/kDAABRZ.jpg?1)

@SuperDave42 - I'm looking forward to seeing your tests with the proper diffuser material, that could take the build to the next level! The edges of my LGP are wide enough to fit 3 LEDs to a side using the higher-density light strips we discussed in the other thread - I think I'll make some small edits to the moodlite v2 model to accommodate that arrangement and post the results.
Title: Re: Better diffusion
Post by: Allistar on January 25, 2019, 07:04:20 AM
https://www.reddit.com/r/prusa3d/comments/aj9p3a/i_designed_my_own_scattered_rectilinear_infill/

Look at that amazing diffusing happening with this guy's developed infill option...  Has anyone tried this yet?
Title: Re: Better diffusion
Post by: hauschka on January 25, 2019, 07:34:21 AM
Definitely some great work.

Would be interesting to see how it looks like on the moodlite panel.
However, his box is massively big which definetly helps with scattering the light as well!
(as in...there is a long distance between LEDs and the diffuser)

Regards,
Title: Re: Better diffusion
Post by: thenickdude on January 26, 2019, 07:22:34 PM
The scattered-rectilinear infill just makes the infill pattern less visible on the surface, I don't think it contributes much to the actual diffusion (diffusion in my design was provided by 1x0.1mm white bottom and 1x0.1mm white top, the total diffuser thickness is 5mm).
Title: Re: Better diffusion
Post by: DevilsDJ on February 10, 2019, 07:14:02 AM
https://www.reddit.com/r/prusa3d/comments/aj9p3a/i_designed_my_own_scattered_rectilinear_infill/

Look at that amazing diffusing happening with this guy's developed infill option...  Has anyone tried this yet?

That guys leds are on the bottom not the sides and the distance between bottom and diffuser is bigger than with the moodlite. For me I made a 5mm taller top with pla diffuser (just remodeled the original top to be 5mm taller , moved the pins and made the sides a bit thicker for less diffusion on the sides) I am thinking of remodeling the tile top frame only so I can fit a 2mm acrylic which I will be sandpaper frosting with the top tile raised 5mm again . Will post results when I do.

Note: this is my raised tile top , I'd say it is much better for diffusion then the original , you cant see the pyramid almost at all. The photos dont do it justice , looks better in real life
Title: Re: Better diffusion
Post by: tg44 on March 16, 2019, 09:17:19 PM
Is sb tried out non-clear plexi? Maybe non-clear plexi with some bathroom glass coverer? I just surfed on the internet and find some really interesting plexi, just wanted to ask if anybody has any experience with them. Also what about layering multiple diffusion layers?

BTW what do you think about the square and hexa shapes (fix the diffusion with picking other shapes)? I think the hexa is much easier to light up without "blindspots".
Other question: Is sb tried to place leds to the edges?