Re: Lighting & Vision

On 17 Feb 2006 18:38:33 -0800, sam.berman@xxxxxxxxxxx wrote:

[snip]

On the other hand there is a
simple and well-established method for such a lighting application and
that is to employ the highest CCT (correlated color temperature)
acceptable to the users. This result has been documented by repeated
studies by Berman et al and independently by Navvab published in the
peer reviewed Journal of the IES. McGowan implies that these studies
are controversial, but the results have never been found by anybody to
be incorrect. The controversy as raised by IES and CIE appears to be
whether they apply for general lighting practice beyond an application
that calls out for best acuity. The IES & CIE concern seem to based on
the their belief that in the workplace environment one never encounters
letters or objects small enough to be at a typical visual acuity
limit.

Sam - you know that my expertise is in the area of light
source technology, not vision science, but I find the
position of the IES and CIE to be quite amazing. I have
found myself working near what I believe is my visual acuity
limit even when I was much younger than I am now, and even
in so-called "work environments." While my office always
had adequate illumination, many conference rooms and
especially meeting rooms at hotels conference centers are
not well lit and I often had trouble reading certain
documents.

[snip]

--
Vic Roberts
http://www.RobertsResearchInc.com
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