In article ,
"Dave Plowman (News)" writes:
In article ,
William Sommerwerck wrote:
And the same will apply to LED backlights. It's a big con that
LEDs are more efficient -- they only are where supplying narrow-
bandwidth light. As soon as you try and make them produce
continuous-spectrum light -- ie white -- the efficiency goes way
down. Of course, they may improve -- but then again, so may
fluorescent.

White LEDs are not continuous-spectrum. They contain a phosphor that
produces yellow light when stimulated by blue light.

Indeed. So not suitable for where you need a decent quality light. As for
an LCD backlight.

I don't see why an LCD backlight needs to be anything other than
red green and blue, and having just checked one, that's exactly
what it is -- actually very much narrower bands than a regular
fluorescent, and without any of the other fill-in colours you
get from a fluorescent lamp. After all, anything else from the
backlight would be wasted (or worse, might bleed through into
some colour cells and contaminate the primary additive colours).

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]