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Posted by Don Klipstein on April 22, 2007, 2:05 pm
>Slorik writes:
>
>> Are there any CFL bulbs that can do this?
>
>Not possible. Fluorescent light is by nature an uneven spectrum, versus a
>even blackbody spectrum from incandescent, filtered to daylight
>characteristics by GE Reveal.
>
>The same people who put "natural color rendering" on fluorescent lamps are
>the ones who put "quiet" on lawnmowers and "low odor" on mineral spirits.
GE Reveal does not filter to daylight characteristics, but selectively
removes much of the yellow, leaving a gap in the yellow.
A spectrum of a GE Reveal (with red and infrared reading low due to type
of spectrometer sensor) is available at:
http://ledmuseum.home.att.net/spectra.htm
The purpose of targeting that slice of yellow for removal is to cause
exaggerated vividness of reds and greens compared to blackbody light of
the same color temperature. With some light removed, Reveal has lower
energy efficiency than other incandescents of same wattage, design voltage
and life expectancy.
Philips TL950 has shown that excellent color rendition is possible even
when the spectrum has spikes and gaps.
- Don Klipstein (don@misty.com)
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