I don't see a wattage given for the bulbs, but lets say they are 15 watts, which I think is pretty standard. That would give you 30 watts on 30 gallons, or roughly 1 wpg
. Not really enough for many lights save the very lowest light requirements.
If you want to grow higher light plants, you may want to consider going with Power Compact lighting, which is a little more expensive.
Another tip: Look on ebay for great deals.
You can find whole hoods out there, but for a 25 galllon you may have to go with glass top and strip light.
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