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'[EE] InfraRed Led question'
2007\09\27@115957 by Andre Abelian

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Hi to all,

I replaced my infrared camera LEDs and I do not see red glow
any more. I started to mess with infrared leds no matter what
I do I can't get it to glow red like the original was. My question is
what kind of infrared LED do Cameras use? I do not see any red on remote
controls ether I see red on night vision cameras only.
any idea?

thanks

Andre

2007\09\27@121913 by PAUL James

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Andre,

If you see RED from the camera, you are probably seeing the focusing
light source.
You cannot see infrared without some sort of help (IR Card, or a digital
camera with an LCD viewfinder).
IR is out of the range of human sight.  Ie Just below RED in the
spectrum.


       
Regards,

       
Jim

{Original Message removed}

2007\09\27@122041 by Robert Rolf

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IR LEDs come in different wavelengths (colors).
The ones with the red glow are near IR, 840 nm wavelength.
There are commonly 880nm and 940 nm.
The 940nm are likely what you installed,
and as a result your camera's response to their illumination will be MUCH less.
Near IR are typically use for color cameras. Far IR for B&W since you get better
sensitivity when no IR cut filter is used (IR messes up the color rendering).

IR remotes typically use 880nm LEDs because they typically have higher power.

http://tech-led.com/index.shtml

http://www.gizmology.net/infrared.htm

Robert

Andre Abelian wrote:

{Quote hidden}

2007\09\27@141403 by Andre Abelian

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Jim,

Sorry I didn't explain in detail. They are infra red leds
and I worked with infrared leds before and I never seen any red
light glow. Robert Rolf explained already see his post.
Thank you for your replay


Andre


{Original Message removed}

2007\09\27@155348 by David VanHorn

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Digikey has plenty of IR emitters, up to 850nM which has a nice dull red glow.
If you're clever with the search engine, you can uncover the Osram
dragons which will do 1A.

2007\09\28@004900 by David VanHorn

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On 9/27/07, Andre Abelian <spam_OUTaabelianTakeThisOuTspammason-electric.com> wrote:
> Jim,
>
> Sorry I didn't explain in detail. They are infra red leds
> and I worked with infrared leds before and I never seen any red
> light glow. Robert Rolf explained already see his post.
> Thank you for your replay

The 850nM leds have a dim red glow.
I don't think it's visible any more at 900nM

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