fluorescent illumination

[P3D <gosfield@xxxxxxxxxxxxxxxxx>]

i spent about an hour surfing around looking for info on daylight lamps, 
standards, sources, and Color Science in general.  Here are some links 
which may be useful to those comtemplating fluorescent viewer illumination.

BTW--i bought easily available (GE F15T8-C50) "Chroma 50" daylight
fluorescent tubes for my standard Luxo desk lamp, and they work very well
for evaluating slides by light reflected off a piece of white paper to
transilluminate. Too simple to even call it 'steal the light'. It looks
about the same as my Logan 5000K lightbox.Of course i don't know if the
intensity is right, since i don't know the ANSI standards.  But if i got
serious, i could use the info below to find out. 

Choosing the Right Daylight Source: 

D75 North Sky Daylight at 7500K is used for visual evaluation of
	opaque materials as outlined by ASTM D1729. 
     
D65 Average North Sky Daylight at 6500K is used to provide visual 
correlation with
spectrophotometric readings or in conformance with European or 
Japanese standards. 

     D50 Noon Sky Daylight at 5000K is used for the evaluation of color
quality and uniformity in conformance with ANSI and ISO specifications
governing the graphic arts. 

What is the difference between D50, D65, and D75? 

The symbols D50, D65,and D75 are shortened versions of the Daylight at 5000K, Daylight at
6,500K and Daylight at 7,500K. 

(D50) 5000K is recognized by the CIE as "Noon Sky
Daylight" and is used in the Graphic Arts Industry for evaluation. 

D65 is Average North Sky Daylight and is used in spectrophotometric 
calculations, and conforms to European and Japanese standards for visual 
evaluation. 

D75 is North Sky Daylight and is used in critical color matching 
applications such as paint, plastics, textiles, etc.
--------------------------------------------------
http://www.tciglobal.com/lamps.html

(table of fluorescent lamps for exposure in graphic arts)

http://www.dolan-jenner.com/light/welcome.html

(well known mfg of fluorescent/fiber optic lighting products for 
technical uses)


http://arachnid.cs.cf.ac.uk/Lad/text.intro.html

(the Lighting advisor--discussion of lighting requirements and methods, 
large useful technical index of methods and diagrams)

http://www.walsers.com/graphic_art/graphar.htm

(graphic arts light boxes which meet Kodak published specs for
critical viewing of transparencies)

http://www.kodak.com/aboutKodak/bu/dai/customer/DAIPrePress.shtml

(Kodak tech info on Pre-Press techniques including illumination
for critical evaluation--oriented toward CRT/digital)

http://www.kodak.com/cgi-bin/webSearchForm.pl

(Kodak data/product search terms entry)

http://www.munsell.com/machome.htm

( color control/evaluation equipment and info)

http://www.munsell.com/solsrc.htm

(a FILTERED TUNGSTEN HALOGEN DESKLAMP with daylight color
temperature, selectable temp for each of the above temp standards)

http://www.munsell.com/hypelink.htm

(links to universities and organizations studying or standardizing
color and illumination)

http://www.hike.te.chiba-u.ac.jp/ikeda/Color/home.html

(TONS of stuff on color printers, video, equipment performance
and  standards, etc. etc.)

http://ziggy.derby.ac.uk/web/colour.html

(THE MOTHER LODE of links to serious color science,
 standards info on lighting souces of all kinds)

--------
now all we need is a source for the proprietary "7-phosphor" high
accuracy fluorescent tubes made by Munsell and included in their equipment

I hope someone else has the energy to find the ANSI standards for 
transparency illumination intensity from a diffuse extended source
like a fluorescent tube.  I couldn't get the RIT link to work.


ted
gosfield@xxxxxxxxxxxxxxxxx


 




------------------------------