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Old 01-19-2004, 11:15 AM   #1
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metal halide bulbs

Where is the best place to get 400 watt metal halide bulbs?
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Old 01-19-2004, 11:46 AM   #2
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and what is the best kind to get?
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Old 01-19-2004, 12:01 PM   #3
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Check our sponsors and what kind...is pretty subjective. I am using a Ushio 175W 10K bulb and have been happy with it, but when I change my bulb out, I am going to try a different brand, probably the Coral Vue 10K or 20K, I will probably buy both bulbs and keep the one I don't use as a spare, incase a bulb disaster happens.
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Old 01-19-2004, 12:08 PM   #4
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whats the difference with 10k or 20k does it really matter?
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Old 01-19-2004, 12:35 PM   #5
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whats the difference with 10k or 20k does it really matter?
10k is supposed to be a perfect white where as the 20k is going to be more in the blue spectrum.. Most people who use 20k bulbs have more of a deepwater selection of corals Ect or just like the Blue look... Bulb Pictures

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Old 01-19-2004, 12:59 PM   #6
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Check this site for some pics and info: www.coralvue.com
Everyone I know who has bought these bulbs has been happy with them and the prices are hard to beat.
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Old 01-19-2004, 01:09 PM   #7
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Hey JJ,

http://www.coralreefsupply.com/index...le=bulbs_mh_cv

These guys always seem to have the biggest bang for the buck on replacement light bulbs - The 400w 10,000k and 20,000k are about 55 bucks there, 90-125 at many other places.

Difference of a 10,000K bulb and a 20,000k bulb basically boils down to the peak wavelength of light that each will produce. K (Kelvin) is related to temperature. Basically as the temp. goes up, the further into the Blue spectrum the peak wavelength/color will fall, go higher and you are into the violet spectrum and then thereafter into the Ultraviolet spectrum.

Generally you can get the peak wavelength of the Bulb by this formula:

PwaveLght=2,900,000/Temp in Kelvins so for a 10,000K bulb the peak will be
2,900,000/ 10,000K or 290 nanometers, for 20,000K bulb the peak is at 145 nanometers (short wavelength, higher frequency peak).

BTW a Kelvin relates to the amount of heat that must be applied to a dark object to generate that particular spectral mix of light. For example, a 2000K Light would be if you heated the dark object so that it was redish, 4500K and it begins to get bluish, etc, etc.

HTH

Important consideration, generally us aquarium folk go way overboard on lighting. The needs of the animals you are keeping likely falls way bellow the 20,000k spectrum and maybe even way below the 10,000k spectrum (see Doc Fenner's info on this at wetwebmedia.com). Also, be careful because as these bulbs go up in K temp they also get dangerously close to the UV spectrum - i.e. MH bulbs do output some UV (not good for you and not good for your Creatures). So High K temp may not be the best thing all around. Recall that natural sunlight is about 5800K.

Tom
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Old 01-19-2004, 01:10 PM   #8
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Everyone I know who has bought these bulbs has been happy with them and the prices are hard to beat.
You can say that again.. I have been kicking the Idea of switching to 20k bulbs as well.. I have 10k XM bulbs right now and I like them but I am more of a Blue person.. Maybe I will order 1 20k coralvue bulb and see if I like it.. Do you see a problem running 1 10k and 1 20k bulb logan?

James
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Old 01-19-2004, 01:30 PM   #9
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Hey James,

A 20,000k bulb peaks in the violet area of the light spectrum not the Blue, so perhaps you are a a bit more of a Violet kind of person

Also, please be aware the the UV that 20,000K bulbs produce is a serious consideration. As I mentioned earlier Bob Fenner's articles on these are really enlightening. He also questions the need for such intensity and whether or not it is healthy for our captive critters as well as their owners

Well, doesn't seem many folks want to listen to this dribble - but here for your use if you wish.

Tom
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Old 01-19-2004, 01:34 PM   #10
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That 12,000k sunburst looks very nice.....
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