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This topic comprises 4 pages: 1 2 3 4
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Author
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Topic: Incandescent light bulbs rule.
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Stephen Furley
Film God
![](http://www.film-tech.com/ubbmembers/1277b.jpg)
Posts: 3059
From: Coulsdon, Croydon, England
Registered: May 2002
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posted 11-27-2007 04:37 AM
quote: Joe Redifer Nowhere on the packaging of these turd bulbs is anything about color temperature.
It does on almost all on the ones I buy here, either directly, e.g. 2700K, like the one I've got in my hand at the moment, or as a three figure number, e.g. 830 or 840. In this case the first digit indicates the Colour Rendering Index, 8 = between 80 and 90, which it will be for just about all lamps of this type, and the last two digits multiplied by 100 are the correlated colour temerature.
Screw-in or bayonet ones with an integrated ballast are almost always between 2700K and 3000K because they're designed to look like the incandescent lamps which they're intended to replace. The pin base type for use with a separate ballast can be obtained in a much wider range; 827, 830, 835, 840 and 865 (daylight) at least, and I've never seen one of these where it wasn't marked on the box. For some reason in the U.S. 4100K seems to be used rather than 400K; I don't know if this is a real difference, or just caused by a difference in the way it is measured.
I've got a Chinese-made American one, if you see what I mean, It's branded 'Feit', in my bedside lamp, and I've just looked at that; I don't have the box for it, but the lamp itself is marked.
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