10-25-2010, 11:22 PM
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I had no luck keeping java moss under the same standard lighting in a 55 gallon tank. IDK maybe you can do better then me, cuz I'm not someone who deals with low light. You are pushing 0.55 WPG in that tank with okay bulbs and pretty inefficient fixtures.
BTW WPG is not flawed. It was designed for T8 bulbs and that is what it works for, you factor higher for small tanks and lower for large tanks. It was a guideline designed to be simple for the hobby, just like the 1" per gallon guideline. Experience can take you beyond the guideline, there purpose is to give beginners the best shot at success while having fun.
There are tons of ways to measure light, the best way depends entirely on what purpose you want the light for. And as always light is a strongly disputed topic. I pick my bulbs based on certain factors, while I know others do differently. If you are talking about measuring light for the aquarium PAR is the best, but least available way to judge to quality of a bulb. You have PUR too, but that kinda overcomplicated things.