On Fri, Jan 29, 2010 at 05:15:51PM -0800, J. Forster wrote:
> To my aging eyes, the flashlight looks distinctly blue-white. I don't know
> how these particular LEDs are built, but the unit is less than a year old.
My understanding is that a lot of high brightness "white" LEDs
are internally a UV emitting LED junction illuminating a phosphor. The
light you see comes mostly from the phosphor.
Lighting type phosphors have been around forever in fluorescent
bulbs... and are fairly continuous spectra mostly...
I don't think there is any way of getting broadband white light
out of a LED junction, though of course hybrids of multiple different
color LEDs can be used (and are in the display business).
--
Dave Emery N1PRE/AE, d...@dieconsulting.com DIE Consulting, Weston, Mass
02493
"An empty zombie mind with a forlorn barely readable weatherbeaten
'For Rent' sign still vainly flapping outside on the weed encrusted pole - in
celebration of what could have been, but wasn't and is not to be now either."
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