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looking for lenses for 24 LED ring
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

looking for lenses for 24 LED ring

by MarkusEugen on Mon Jun 22, 2020 12:36 pm

Hello all,

I am using the 24 LED ring (https://www.adafruit.com/product/1586) to designing a prototype.
I am looking for LED lenslets (micro lenses) - to magnify the light in order for focusing at 2.5m distance on a wall.

Any suggestion?

Thank you all,
Markus

MarkusEugen
 
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Re: looking for lenses for 24 LED ring

by adafruit_support_bill on Mon Jun 22, 2020 12:39 pm

I'd try one of the LED specialist sites such as www.ledsupply.com.
You could also do a web search for "5050 LED Optics"

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Re: looking for lenses for 24 LED ring

by MarkusEugen on Tue Jun 23, 2020 3:47 pm

Thanks a lot!
just to understand this right, this would be the right lens:

https://www.ebay.com/itm/100PCS-30-degr ... 2284658554

MarkusEugen
 
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Re: looking for lenses for 24 LED ring

by adafruit_support_bill on Tue Jun 23, 2020 4:49 pm

That looks like it should fit.

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Re: looking for lenses for 24 LED ring

by MarkusEugen on Sun Jul 12, 2020 4:38 am

Hello,

Got the lenses, and the result is disappointing. Because of the displacement of the R,G,B led the projection is not overlapping :(
I have attached a picture. Are there other option for lenses that will create a better projection?
Attachments
IMG_4839.jpg
IMG_4839.jpg (28.61 KiB) Viewed 21 times

MarkusEugen
 
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Re: looking for lenses for 24 LED ring

by adafruit_support_bill on Sun Jul 12, 2020 6:05 am

The lens is just projecting what is behind it. To merge the 3 channels into one image would require specially designed optics and extra precise alignment with the die. And it would probably only work at one distance.

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Re: looking for lenses for 24 LED ring

by MarkusEugen on Sun Jul 12, 2020 10:15 am

Are there other LED types that work better?
also would it be possible to put a diffuser in the light path?

MarkusEugen
 
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Re: looking for lenses for 24 LED ring

by adafruit_support_bill on Sun Jul 12, 2020 10:40 am

We have diffused through-hole Neopixels in 5mm and 8mm packages: https://www.adafruit.com/product/1938
But I'm not sure if anyone makes lenses for that form-factor.

You could try adding some diffusion to what you have now.

Adding diffusion to the front of the lens will probably be more effective at blending the output of the 3 emitters. But it will disperse the beam somewhat

Adding diffusion between the Neopixels and the lens probably won't be quite as effective at blending, but should keep the beam nice and tight.

An easy way to add diffusion to a LED or a lens is to just scuff the surface with a light abrasive. Scotch-Brite™ pads work pretty well. You can adjust the amount of diffusion by how aggressively you scrub the surface.

You'll probably need to experiment a bit to find the best compromise.

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Re: looking for lenses for 24 LED ring

by MarkusEugen on Tue Jul 14, 2020 2:25 am

Thanks for the link, how can I use the thru hole LEDs to make the same functionality as the ring? is the control IC available separately?
Do you have links for diffusion materials that fit the small size of the SMD?

MarkusEugen
 
Posts: 5
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Re: looking for lenses for 24 LED ring

by adafruit_support_bill on Tue Jul 14, 2020 5:31 am

how can I use the thru hole LEDs to make the same functionality as the ring?

The through-hole Neopixels linked have the control chip build-in and can be daisy-chained just like regular Neopixels. The software to control them is the same. However, you do need to add a 0.1uF ceramic cap per pixel as shown in the sample schematic on the last page of the data sheet: https://cdn-shop.adafruit.com/product-f ... sheet+.pdf
is the control IC available separately?

We do have the bare WS2811 driver chips also: https://www.adafruit.com/product/1378
Do you have links for diffusion materials that fit the small size of the SMD?

The simplest way is to just scuff the surface as mentioned in my previous post. You can also use matte tracing film. It can easily be cut to size with scissors.

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