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Old August 29th, 2005, 03:43 AM   #1
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Where to buy 6500k lighting fixtures?

From what I'm read, the standard for setting up a studio for color correction is:

Monitor at 6500K (correlated) color temperature.
The area behing the monitor should be a neutral gray, lit by a 6500k lighting fixture (reflected or diffused light).

The higher the CRI the better.

My question is, where would one look to get an appropriate lighting fixture?

(My location is Toronto Canada.)
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Old August 29th, 2005, 11:08 PM   #2
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Glen if I get it, you want to illuminate the area behind it for reference.You could use flourescent as your not shooting this area.Grow bulbs for plants are commonly 6500k, could you use that?
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Old August 30th, 2005, 01:13 AM   #3
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Most of the florescents I see have kind of low CRI ratings.

Now I'm doing a little research on:
High-CRI florescents (i.e. Kinoflo, the lights Matt are working on). Those might be suitable?

6500K incandescents (100CRI as long as there's no filtering going on apparently). EDIT: It may be that "daylight" incandescents get that color temperature because there's some filtering going on. Apparently tungsten melts at above 3650K, so you can't get a 100CRI light above that.)

An incandescent with color correction filters/gel on them.

Last edited by Glenn Chan; August 30th, 2005 at 08:35 PM.
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Old September 4th, 2005, 02:45 AM   #4
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Ok, did some more research.

Apparently, the video standard is D65 (also known as D6500). This is slightly different from 6500K.

D65 is based off the color of sunlight at a specific latitude, time of day, and location. Sunlight is sometimes close to D65.

6500K is based off the color of a black body heated to 6500 degrees Kelvin. When stuff is heated, they emit light.

D65 is slightly greener than 6500K.

2- OSRAM Sylvania lists a "daylight deluxe" light with a correlated color temperature of 6500K and CRI of 88.

From Searching for "daylight deluxe" in quotes on the OSRAM Sylvania homepage
It has "lamp x"=0.313 and "lamp y"=0.337
If these are chromacity co-ordinates, this puts these phosphors really close to D-65.

If you look at page 7 of http://www.etconsult.com/papers/whitepoint.pdf, you can plot it out for yourself.

That lists only phosphors though, for companies that are making lights.

I'm trying to figure out where you can buy the "daylight deluxe" lights, which presumably have those phosphors?
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Old September 4th, 2005, 10:12 AM   #5
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Glen ,I believe what your looking for is available in pet stores and plant stores.Here is a link to the Zoo Med bulbs 6500k 98 CRI http://www.epetpals.com/cgi-bin/comm...y=097612054484
I think the daylight deluxe can be found in Walmart
EDIT here is a Canadian on line order for the Zoo Med
http://www.bigalsonline.ca/catalog/p...tegory_id=1843
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Old September 4th, 2005, 11:33 AM   #6
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Hey Jack, thanks for that link.

A- The description reads "Balanced coverage of the full spectrum of visible light as well as UVA".

Do you think the UVA will be a problem? I don't want to get skin cancer here.
A little UV light is good for you so you don't get vitamin D deficiency (apparently an issue for people who live in siberia, where they don't get much sun in the winter), but too much and you may increase the chance of skin cancer. :/

B- The 5500K version of that lamp looks like a good way to get a cheap DIY kinoflo alternative??

If it emits enough UVA that people get tanned, it may not be appropriate due to continuity reasons.
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Old September 6th, 2005, 09:10 PM   #7
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I emailed Zoo Med and received this reply from them:

Quote:
Glenn,


You can use them without any trouble at all. In fact, I use some of our aquarium lamps in my office. Essentially all fluorescent lamps emit some UVA, and there is no trouble with that; the UltraSun does not have a particularly high UV output compared to other "full spectrum" bulbs (and emits almost no UVB).

Bottom line: you won't get a tan or cancer or eye strain, or anything else from these lamps. Like all light sources, don't stare directly at them.

Thanks,

Colin F. Purcell

Director of Customer Service

Zoo Med Laboratories Inc.

3100 McMillan Avenue

San Luis Obispo, CA 93401

(805) 542-9988

colinp@zoomed.com

www.zoomed.com
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Old September 6th, 2005, 11:06 PM   #8
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Certainly on a TV production continuity could be a problem.Over 17 shows I'm sure the talent would develop more character than they care to.

I've not used these but a test with 1 would help.I don't know how much illumination you would get from 1 unit.If it worked out ,it might make a good kino alternative .Of course you would need a stable ballast for shooting.Good thinking though.
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