[Laser] White color LEDs

[Bob Blick]

On Thu, 21 Oct 2010 14:08:48 +0300, "Zilvinas, AUGMA" said:
> Hi all,
> 
> There are many cheap powerful white LEDs available (f.e. dealextreme.com)
> Are there any _significant_ disadvantages using white color instead red 
> in our applications (voice comms)?

Although laser diodes are generally much faster than LEDs, the speed of
white LEDs is comparable to other LEDs. But detectors are more
responsive near the red end of the spectrum, so matching LED to detector
is good.

Here is a comparison I did several years ago with different LEDs and
also a laser diode:

http://bobblick.com/led_speed_test/

Cheerful regards,

Bob

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