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Old 01-19-2004, 05:20 PM   #11
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Quote:
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).
Uh...OK, gotta take you word for it, my nerdspeak to science moron dictionary is on the fritz.

Simply to add to what MadNeucleus has posted in antecdotal terms. The higher the K rating goes the more colorful your colors get, this is probably due to the corals needing to create pigments to protect them from the high UV being produced by the bulb. Many are finding the 20K bulb to be a nice color that is pleasing to the eye. 10K is supposed to be a compromise between color and growth and then the 6700Ks are noted for the growth rates of the corals. FWIW, the K rating is gonna be a personal preference thing, most find the 10K very pleasing and I have used it for a little over a year, but was unhappy with the amount of color shift I got from the Ushio bulb after a few months of use. Since I am switching brands, I also thought...hey why not give the 20Ks a shot and see what it looks like, if I don't like it, I'll also have the 10Ks which have been consistantly pleasing to me.
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Old 01-19-2004, 07:38 PM   #12
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Hmmm,

I wonder if the original poster of the question has read any of this

Thanks reefrunner, I have now been firmly planted in the realm of geekdom. Yikes!

Yep - what you say makes a lot of sense. Didn't think why everyone is so tempted to the 20,000K bulbs - even snapcrackle made an illustriously enlighting and philosophilcal observation:

Quote:
The 12,000K sunbursts look very nice....
Anyway - thx for pulling me back into the world of reality - also if you'd like some sources for the calculations etc. pls let me know. I'll find some, but I that came from recollections of college physics.


Tom
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Old 01-19-2004, 07:46 PM   #13
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Thanks reefrunner, I have now been firmly planted in the realm of geekdom. Yikes!
LOL, I thought it said more about me than you
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Old 01-19-2004, 09:20 PM   #14
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Couldn't resist - one more post on this subject. Kevin - you might like this one. It's a program that lets you clike or enter the Kelvin (temp. of item) and then displays the intensity of the spectrum created and then on the left the resulting color.

Really cool. Also note that 5000K is pure white.

Anyway - only added here for some fun.

http://skyserver.fnal.gov/en/proj/ad.../blackbody.asp

If you click anywhere in the light curve it tells you the wavelength in Nanometers and also lets you drag it to different locations - as you drag the curve it shows the new spectrum and resulting color and Temp in K.

Tom
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Old 01-19-2004, 10:45 PM   #15
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That is pretty **** cool!!!!
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Old 01-20-2004, 12:51 AM   #16
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To answer the question James had, I don't think there would be any short term problems with using one 10k and one 20k long enough to see if you wanted to make the switch. I know some folks with larger tanks run a combination of 10k and 20k instead of using actinics. It would certainly show the difference in the colors of the bulbs. I wasn't aware of the higher levels of UV produced by the higher K bulbs and I will certainly look into that.
FWIW, Coral Vue offers their bulbs in 12k and 15k for those who don't want to be "violet" . As far as I know, these are not available at this time in 400w though.
Jerejohnson,
Did we answer your question? Or totally confuse you? Personally, I kinda favor the Coral Vue bulbs. And, yes, the fact that I sell them on my commercial site probably has something to do with that . But, I do think they are the best value available in a MH bulb right now. Check out the sponsors on this site...there are several. Also, look at www.hellolights.com as they usually have good deals and are a reputable retailer. Champion Lighting would be another place to check out at www.championlighting.com . They carry a line of bulbs called Blueline. I don't know much about these bulbs, but I know Perry at Champion is top notch and a pleasure to deal with. HTH.
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Old 01-21-2004, 11:00 AM   #17
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Thanks for clearing it all up everyone, actually confusing me but it helps, the 6700Ks are better for growth the 10,000 are a comprimse between growth and color and the 20,000 are for better color and they are more pleasing, is there any down side to running all three? i have 3 400 watt ballasts or should i run 2 of 20,000 for the color and 1 6700Ks for growth or just one of each? any help is great. thanks for all the quick replies, the advice is the best on the web.
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Old 01-21-2004, 12:41 PM   #18
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Running different colors of MH is a common setup. It really depends on how your bulbs are oriented. If you have a 6' tank with three bulbs over it, I think you'd see a difference in the colors of the tank from one bulb to the next. If you had the bulbs closer together so that their coverage overlaps, it wouldn't be so noticable. A MH bulb is good for about 2'x2' of coverage.
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