No, blue LEDs have been in production for some years now. No
phosphors, which is why they are so cheap to run. Something like 3W
is equal to a 40W incandescent, and if the LEDs were properly made
and the underlying materials are good (the plastic frame, solder,
etc) they should last essentially forever.
Big problem at the moment is getting 110V bulbs at a reasonable
price. Most of them are 220V for the European market, and they won't
just plug in.
The next thing that will show up, I think, is 12V wiring to get rid
of the necessary power supply in each lamp -- that would push the
price down a couple of bucks each!
Peter
On Jan 21, 2012, at 10:46 AM, Jim Cathey wrote:
Not bad for a permanent [LED] lamp.
Why 'permanent'? So far as I know all 'white' LED's are just
fluorescents, but excited by UV from an LED rather than a
mercury vapor discharge. So besides the aging of the LED
itself there's phosphor aging too, just like a conventional
fluorescent. (Which dim over time.)
-- Jim
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