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Old 01-02-2005, 04:48 PM   #1
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What's the diff?

Did my yearly changing of the bulbs - even though I put a new bulb on the sw tank 4 months ago (I remember better if it's at the beginning of the year. So my question is, what is the difference in a 40W 10,000K bulb and a 40W 18,000K bulb? I put the 18,000K on the tank, but don't know the difference. Lighting has me confused.

55 gal. reef. Coralife lunar lights 4 x 65, 120 lbs live rock. Remora skimmer, 3 power heads. 2 tank raise false percula,2 pajama cardinal,hermits, snails, Xenia, leathers, mushrooms, polyp frags, yellow sea cucumber, And last but not least - the miserable mantis.
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Old 01-02-2005, 05:00 PM   #2
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I beleive the higher the number the more blue the spectrum is. For example with a 10,000k you would also need a blue actinic with it but with a 20,000k you would not because the 20's have a heavy concentration of blue waves.

Good luck! Kat
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Old 01-02-2005, 05:38 PM   #3
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The K refers to Kelvin which is the SI unit of temperature. The higher the temperature the more blue light is produced. Blue stars are hotter than red giants. Yellow- green stars ( like our own) are sort of middle of the road temperature wise. Blues would have a higher Kelvin value than a red.

The sun produces full spectrum. Blues are shorter wavelengths of light and can reach the lower depths of the ocean ( or tank) since they are not absorbed by the water as readily as the reds. This all has to do with the bonding structure of the water molecules and the molecular size.

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Old 01-02-2005, 06:11 PM   #4
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That's okay - I'm an elementary science geek. I teach elementary science to grades K-6. Not much need for Kelvins at this level. I'm more into physical science and environmental science. Lots of fun, but I really don't understand the upper level" stuff like light!

So, I guess I'm better off with the one 18,000K for now.

Thanks for the help.
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