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Old 12-19-2012, 11:36 PM   #11
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I have 2 65 watt 10kk daylight 2 65 watt actinic coralife system with 4 moon light LEDs. It's a 55 gallon tank. Is that enough? I have always heard about 3 watts per gallon. And with the sand and live rock I actually only have 45 gallons of water.
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Old 12-20-2012, 05:57 AM   #12
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Quote:
Originally Posted by jlehring View Post
I have 2 65 watt 10kk daylight 2 65 watt actinic coralife system with 4 moon light LEDs. It's a 55 gallon tank. Is that enough? I have always heard about 3 watts per gallon. And with the sand and live rock I actually only have 45 gallons of water.
The watts per gallon standard is a very old rule of thumb that is not accurate. It all depends on what kind lighting. 3 watts per gallon would only be acceptable for LED's. what kind of lights are you running and how long is your tank? Sounds like you have enough light unless you are running power compact bulbs on a tall tank. The wattage ratings run high on PC bulbs and are really deceiving as they are not as intense as T5s, MH, and LEDs, which is why the watts per gallon rule is not accurate.
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Old 12-20-2012, 04:10 PM   #13
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The basis for the watts per gallon rule had to do with penetration. If we assume (don't, btw. Lol) that all lights were to put out the same spectrum of light, then wattage could be used to determine how deeply the usable light would penetrate. Since tank sizes are relatively standard, one could reasonably estimate how many watts per gallon.
But there are far more lighting options today than there were when these guidelines were created. The only way to really be sure is to buy or borrow a PAR meter and check light levels at various points in the tank.
Beyond that, there are numerous threads discussing the best lighting options for different tank sizes. How deep is your tank?
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