I don't think it will be that bright, two lights aren't twice as bright as one, 8 lights would be twice as bright, thats why I say I would rather wait till the higher wattage comes out.
If you want a good light for a 10 gallon, give me a PM I know where you can get a deal on a 400 watt MH.... (okay its a bit of overkill, but hey I bet stuff grows well)
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