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Looking at non-aquarium light fixtures yesterday, I noticed a lot said something like "uses 17 watts, gives 75 watts worth of light" or something similar. Coming home and looking at the flourescent bulb in my secondhand aquarium light, I see it says 25 watts but to me the bulb looks equivalent in light output to, say, a 100 watt incandescent bulb. Is there a convesrion factor that can be applied? I wnt to bring my light in that tank to 3 wpg, so I need to know how much I have now.