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Old 10-09-2004, 04:28 AM   #1
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Geeky question about Kelvin rating

I'm sorry to ask such a geeky question, but this is the sort of stuff engineering students do on weekends.

They say the Kelvin rating on light bulbs is a measure of the color of the light. Well the Kelvin I know is a temperature scale like Fahrenheit or Celsius. Are the two related? I thought it might have something to do EM wavelengths corresponding to black-body radiation at that temperature.

If my assumption is correct then a 5800K bulb matches the light from the sun (generally speaking) better than any else. Below this gets bad real quick and above this get gets bad - but not as quick.

Any thoughts?
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Old 10-09-2004, 06:11 AM   #2
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I thought it might have something to do EM wavelengths corresponding to black-body radiation at that temperature.
Exactly. I wouldnt say going above 5800K is all that bad though.
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Old 10-09-2004, 09:20 AM   #3
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You are correct. Kelvin is actually the color that a carbon body would radiate if heated to that temperature. With the base being of course Absolute 0.

At least that's my understanding.

And most people use bulbs in the 5000k-10000k range. I prefer 6700k, 8800k and the GE 9325K bulb.
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Old 10-09-2004, 05:25 PM   #4
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[quote="Rex Grigg"]You are correct. Kelvin is actually the color that a carbon body would radiate if heated to that temperature. With the base being of course Absolute 0.

At least that's my understanding.
[quote]
Correct.
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