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Old 06-28-2010, 10:29 AM
Wallenstein Wallenstein is offline
Join Date: Oct 2001
Location: Midlands, UK
Posts: 3,141
I asked my Dad about this (he's is/was a physicist).

The wavelength for the blue LED is such that the human eye has trouble resolving it. We had to chuck out our blue LED alarm clock for exactly this reason - or some reason it was uncomfotable to look at in the dark.

I will google to see if I can find confirmation but I'm sure a Doper Physicist will be able to explain better.


Some details there.

Last edited by Wallenstein; 06-28-2010 at 10:31 AM.