At 10.18 2012.02.15, you wrote:
>On Wed, 15 Feb 2012 02:34:27 -0500, you wrote:
>
>>1. It seems that some infrared LEDs also produce a very small amount of r=
ed
>>light. I powered some on, and looked at them directly for a few seconds a=
nd
>>saw a small amount of red light being emitted. Why does this happen?
>>
>>2. What are the effects of staring into a bright infrared LED for some ti=
me
>>(about the brightness of a bright flashlight that you normally couldn't
>>look at for  more than a few seconds)? Since you can't detect the light,
>>you don't have that reflex to look away from the bright source. Does this
>>damage the eye if you continue to stare at it for some time (longer than
>>you normally could into a bright flashlight)?
>
>It's not that the LED emits red, but some eyes have some sensitivity =20
>to near IR.=20

I don't have this luck, I can't see any red. :[


>The problem is that as the eye sensitivity is low, the amount of IR=20
>entering the eye could be very
>high, and can't be judged by the perceived intensity.
>
>I doubt a normal 20mA LED carries any hazard, but high power emitters=20
>and  laser diodes could well cause damage.

Only thermal damage is possible, or..?

--=20
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