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Old 04-21-2008, 04:40 PM   #11
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Ok...way over my head. I'll just stick with replacing my MH bulbs every 6-8 months. I need to find a "light bulbs for dummys" book somewhere.
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Old 04-22-2008, 12:15 PM   #12
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check out the new tubes from Longiotti LEDs
then there will be no need to replace bulbs.
I have a 90 gallon tank and I was running VHOs. I was replacing my bulbs twice a year. I got these and the color output is amazing. no need to replace bulbs and they consume half the electricity of VHOs. the blues are amazing, I love these things.
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Old 04-22-2008, 04:23 PM   #13
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Ziggy, you are right. I am now looking at one of these:
Quantum Meters: Apogee Instruments: OPTIONS PRICING
or
http://www.licor.com/env/PDF_Files/250ABro04.pdf

I found some great info at:
Advanced Aquarist's Online Magazine - Product Review: A Comparison of Two Quantum Meters - Li-Cor v. Apogee

Thanks for pointing me in the right direction James!
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Old 04-22-2008, 04:31 PM   #14
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Well I don't know what I was right about this thread has completely confused me with lux and all that.

BRK uses a PAR meter to determine light intensity at different depths in the tank. I do know that it is best to use the PAR meter when your pumps are running as they normally would. By doing this you will get a more accurate idea of what kind of PAR you are getting at any given depth in the tank. The trick is to watch the meter for a few minutes and get a "high" and "low" reading and go with an average. If you shut your pumps off and the surface is calm you will be getting false readings because the ripple does make a difference on how the light penetrates the water.
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Old 04-22-2008, 04:40 PM   #15
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You are very welcome
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