From: "Lewis, Alan" <LewisA@ncopost.ne-optometry.edu>
To: Color and Vision Network <cvnet@lawton.ewind.com>
Subject: RE: CVNet - reply (3) to query on easel lamps
There have been a number of studies that have looked at the relationship
between spectral power distribution of light sources and the suitability of
those sources for use with specific color vision tests. There also was a
recent CIE Technical Committee under the chairmanship of Steve Dain which
was preparing a report, but I believe that the committee was disbanded at
the Warsaw Quadrennial meeting of CIE.
The Chromalux lamp is made with glass that has a strong absorbance in the
"yellow" portion of the spectrum and, consequently, would not be a suitable
lamp for use with some of the reflective color vision tests.
Alan Lewis
> -----Original Message-----
> From: Color and Vision Network [mailto:cvnet@lawton.ewind.com]
> Sent: Friday, May 19, 2000 2:32 AM
> To: CVNetList@lawton.ewind.com
> Subject: CVNet - reply (3) to query on easel lamps
>
>
> Subject: Re: CVNet - reply (2) to query on easel lamps
> From: "Mary A. Johnson, Ph.D." <mjohnson@umaryland.edu>
> To: Color and Vision Network <cvnet@lawton.ewind.com>
>
> I've always wondered if light sources for color vision testing aren't
> incredibly over-specified, which is why they end up costing so much.
> Has anyone performed a spectral analysis on "daylight" bulbs
> that have been
> pitched to general consumers interested in the mood-enhancing
> effects of
> natural lighting? In particular, there is a "chromalux" bulb
> manufactured
> by Lumiram, available for about $8, that is proported to
> simulate natural
> daylight.
> Thanks.
> ----------
> >From: Color and Vision Network <cvnet@lawton.ewind.com>
> >To: CVNetList@lawton.ewind.com
> >Subject: CVNet - reply (2) to query on easel lamps
> >Date: Tue, May 16, 2000, 4:57 PM
> >
>
> >From: "Scott E. Brodie, MD, PhD" <brodis01@doc.mssm.edu>
> >To: Color and Vision Network <cvnet@lawton.ewind.com>
> >Subject: Re: CVNet - query; sources for easel lamps
> >
> >The MacBeth Easel Lamp went out of production in the late 1980's. (No
> >wonder -- they were charging about $500 for this awkward, heavy
> >cast-iron table lamp.) The key "magic" element, the blue
> glass filter,
> >was available separately from MacBeth, but they have sold
> off the last
> >of these, and they are no longer available either.
> >MacBeth (as well as Munsell Color) is now a part of
> "GretagMacBeth" (see
> >http://www.gretagmacbeth.com/index.html). They sell a large
> variety of
> >carefully calibrated light sources, most intended for industrial
> >applications.
> >
> >Perhaps their handiest product is the "Sol Source" Daylight
> Desk Lamp, a
> >spring-counterbalanced articulated arm desk lamp, which provides a
> >choice of three calibrated color-temparatures by means of a "filtered
> >tungsten-halogen source." Over the phone, their sales rep
> confirmed that
> >this is an approved light source for color vision testing,
> as for the FM
> >100-Hue test. The price is $395; delivery takes is quoted as about 8
> >weeks. I have no personal experience with this item.
> >
> >You might also try the "True Daylight Illuminator" available
> from Wilson
> >Ophthalmic Corporation (priced at $286.12 in their 1999 catalog). The
> >catalogue entry reads "... provides a light source rating of C.R.I 90
> >and 6200 deg K, UL approved." This appears from the photo
> to be a small
> >"Easel Lamp", with a shielded bulb housing which runs across
> the top; it
> >holds a book of color-test plates nicely. Again, I have no personal
> >experience with this item.
> >
> >Hope this helps.
> >
> >Scott.
> >
> >Scott E. Brodie, MD, PhD
> >Mount Sinai School of Medicine
> >New York
> >
> >brodis01@doc.mssm.edu
> >
> >
> >Color and Vision Network wrote:
> >
> >> From: "Neil Parry" <nparry@fs1.cmht.nwest.nhs.uk>
> >> Organization: University of Manchester
> >> To: Hoover Chan <hchan@kirkham.ewind.com>
> >> Subject: CVNET - Query on Easel Lamps
> >>
> >> Does anybody know the source of daylight illuminators
> >> like the Macbeth easel lamp? I understand these are no longer
> >> manufactured, but perhaps someone out there knows of a secret
> >> supply, or a suitable alternative.
> >>
> >> Thanks,
> >>
> >> Neil Parry
> >>
> >> Replies to Neil.Parry@man.ac.uk
> >
> >
>
This archive was generated by hypermail 2b29 : Fri May 19 2000 - 12:10:18 PDT