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Author Topic: Help with determining LED lens type  (Read 1099 times)

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Offline hcglitteTopic starter

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Help with determining LED lens type
« on: November 03, 2021, 10:33:25 pm »
Hi,
I am trying to figure out what the kind of lens which is able to focus a LED die over distance is called.

Some cheap telescopic zoom flashlights have them.

In the video demo for this flashlight, the LED die is focused on the wall:

https://m.aliexpress.com/item/33048502842.html

Any help is appreciated. Thanks.
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Offline jbeng

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Re: Help with determining LED lens type
« Reply #1 on: November 04, 2021, 04:01:01 am »
The type that is in the cheapie led flashlight I have just lying around is a "plano-convex" lens.  That is to say, it is flat on one side, convex on the other.
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Offline ajb

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Re: Help with determining LED lens type
« Reply #2 on: November 04, 2021, 04:50:16 am »
AFAIK all of those flashlights use a fixed reflector and then a moveable plano-convex lens.  That's really all you need for a flashlight, since you're not imaging and don't care all that much about chromatic aberration. 
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Offline DeanA

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Re: Help with determining LED lens type
« Reply #3 on: November 04, 2021, 04:53:47 am »
Have you seen range of LED lenses available from these types of companies:
https://www.ledil.com/
http://www.carclo-optics.com/
http://www.ilenstech.com/


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