If you care about accurate colour rendering, stick with incandescent,
preferably halogen. "White" LEDs are actually blue LEDs coated with a
phosphor that absorbs some of the blue light and emits approximately
yellow instead. If you look at the spectrum, you'll see a broad yellow
peak and a narrower blue peak. Your eyes see it as approximately white,
but it's deficient in red and green compared to a black body emitter
like hot tungsten. On the other hand, it's not as spiky as the output
of fluorescents.
The particular IKEA units I have both look approximately "daylight" in
colour temperature, and the colour is pretty uniform across the
illuminated field (except for the very edge, which is yellow, but that's
probably due to chromatic aberration in the lens, not the LED source).
They work better than most of the LED flashlights I've seen, which tend
to have large intensity and colour changes between the centre and the
edge of the illuminated field.
Dave
On 30/01/2010 07:49, paul swed wrote:
IKEA and $39 per lamp. Sounds like some pretty good margin in the sale.
I guess these LED things will be main stream and save the world when we see
them at walmart for $6.
On my bench I converted to 60 watt halogen lamps compared to the 100 watt
lamp.
Equivalent color spectrum to the traditional lamp also. For as many hours as
that light is on. I suspect I am saving some money in the long run.
Curious are these lights truly white or do they tend towards a traditional
lamp spectrum.
Regards
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
