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Old 10-09-2006, 06:57 PM   #1
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2 + 2 = 4 ????

hope ya don't think this is a real STUPID question , i just dont know .
lighting - 1 x25w. + 1 x 25w. = 50w. or does 25 w. = 25w. nomater how many there is ??? "I'M EMBARRASED"

thanks - oldfishead !!!
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Old 10-09-2006, 07:00 PM   #2
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No, you have it right 25w+25w = 50w. I believe what matters is:

1) What you have in your tank (i.e. corals (sps, lps etc...) anenomes, clams, etc...)
2) How deep your tank is. It takes more watts/gallon to reach the deeper parts of the tanks

I am sure someone with more experience than me shall correct if I am wrong
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Old 10-09-2006, 07:01 PM   #3
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To answer this, think about the intensity of light of a 25w bulb. Now put two of them, side by side. Now put one 50w bulb next to the others. Which would be brighter?

It does not make sense to me either, yet it kinda does. We are not supposed to add the wattage together, yet we are forced to when people ask us how many watts per gallon we are running...
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Old 10-09-2006, 07:21 PM   #4
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so it does increase light intenseity 2 fold i.e. 2+2=4 !!!!
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Old 10-09-2006, 09:07 PM   #5
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Yes to figure out total wattage in your tank add them together.
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Old 10-10-2006, 04:41 PM   #6
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That's not really how it goes...
Would four 110 watt VHO's (totaling 440 watts) be as bright as one 400 watt metal halide? No.
A 400 watt would be brighter than even six 110 watt VHO's. For they are still only 110 watts each!
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Old 10-10-2006, 06:53 PM   #7
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No it`s not how it goes but that`s the way they figure out WPG. I mean you`re using that example and yes you are right they would not be as bright but you would not get the coverage from 1- 400 watt light bulb in your tank as you would from 4- 100 watt light bulbs across the top. We are talking about TOTAL WATTAGE.
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Old 10-11-2006, 11:55 AM   #8
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There you go again, defensive posture and yelling. I'm starting to worry about this.
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Old 10-11-2006, 01:09 PM   #9
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"I'M STILL CONFUSED"
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Old 10-11-2006, 02:47 PM   #10
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Dont be confused oldfishead. The way we figure out lighting is old school. But we still use it because we are talking about watts per gallon. I say old school because you need to think about how deep your tank is and what corals you have and other things involved. The simplest way to figure this out is total wattage / gallons of water = watts per gallon. You can then figure out what type of corals you can then have. Some People like to make people think they are so smart they try to confuse people. My intention is to keep it simple so we all understand. I dont need to prove to anyone how smart I am. I know I`m here to help. Maybe some other folks will add on. As I said dont be confused. Good Luck.
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