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Editor's note: This excerpt first appeared in photographer and author Harold Davis' recent Focal Press book, Photographing Flowers: Exploring Macro Photography with Harold Davis. The closer you...

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State of the ART: The Little Lens That Could Read More

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Color temperature of GE Reveal bulbs, according to GE

Aaron James , Nov 30, 2004; 07:27 p.m.

Perhaps nobody cares about this, but just in case. In a post quite awhile back someone said that they measured the color temperature of GE reveal light bulbs to be around 3400K. I emailed GE and a customer service person responded and said that they burn at 2850, quite a bit cooler than previously posted. Now of course, it might be wise to trust the person who actually took a temperature measurement (owing to sample variations?), but the discrepency is worth noting.

Responses

Michael Ging , Nov 30, 2004; 07:33 p.m.

2850 would be warmer than a regular bulb, not cooler.

Shourya Ray , Nov 30, 2004; 09:13 p.m.

...responded and said that they burn at 2850,..

My understanding is that these are normal household tungsten bulbs with neodymium coated glass that filters the light. So the bulbs may very well "burn" at a fairly warm temperature of 2850 but the light is being filtered. Hence, the final temperature may be cooler, but still won't be anywhere near the 5000K light that we get from strobes.

Aaron James , Dec 01, 2004; 06:45 a.m.

Hmm. So perhaps I should have phrased my question differently? I'll try again and ask them what color temperature it actually puts out (as opposes to burns). Does it sound reasonable that that extra coating could make about 650K difference in output color temperature (which would be the case if the bulb burns at 2850, but outputs 3400k)?

Frank Kimble , Dec 01, 2004; 10:22 a.m.

3400-2850=550

Aaron James , Dec 01, 2004; 04:36 p.m.

Oops.

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