03-19-2009, 05:31 PM
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Yes, that's going to be a lot of light, looks like 4 watts per gallon. Can you remove two of the tubes to keep two on? As the tubes wear out in one year (they will still light but the light is not strong enough for the plants, so most aquarists replace the tubes every year) you can use the two you remove as the new ones, so they're not wasted. Two watts of light, on for 10-12 hours each day, will enable you to grow a number of plants, providing the nutrients and water parameters are acceptable. Depends upon what plants you want, sokme need more light and nutrients and CO2, others don't.