Request for Question Clarification by
byrd-ga
on
14 Dec 2005 09:49 PST
Hi Sharon,
Since I also have a personal interest in SAD, out of curiosity I
recently did a search for information on the subject of "full
spectrum" lighting. I was confused by all the conflicting claims, not
to mention the huge variation in prices. You might be surprised, as I
was, to learn that actually "full spectrum light" is not a technical
or scientific term, but rather a marketing phrase, with no consistent
consensus on meaning, let alone efficacy. Rensselaer Polytechnic
Institute conducted and published the results of a comparative study
on this type of product. I think you might find the paper quite
interesting.
The abstract says, "Lighting Answers:Manufacturers of full-spectrum
light sources have claimed a variety of benefits for their products,
including better visibility, improved color rendering, better health,
and greater productivity. Light sources promoted as full-spectrum can
cost over ten times as much as nearly identical products that do not
bear the full-spectrum claim. This report addresses questions about
full-spectrum light sources: What are full-spectrum light sources? How
valid are the claimed benefits? Are these products worth the extra
cost? This report also proposes a convenient definition for
full-spectrum light sources that can be used to quantify the extent to
which a given light source deviates from a full-spectrum light source.
This revision presents an improved calculation method for this new
full-spectrum metric."
Here is the link to the full paper:
http://www.lrc.rpi.edu/programs/nlpip/lightingAnswers/fullSpectrum/abstract.asp
Please let me know if you believe this information answers your
question. If so I'll be happy to post it as the 'official' answer. If
not, hopefully another Researcher can find more for you.
Best regards,
Byrd-ga