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doesn't matter what watts cuz LED should not use watts/gallon to messure.
As long as you can get 250~500 in PAR then you are good with SPS. 150 ~350 for LPS and 80 or higher for softies.
yup, few things also good to check while looking at the fixture
1)brand name of the LED being used, that would determined 80% of the price of the fixture (CREE/Bridgelux/EPISTAR/OSRM etc)
2)spectrum graph that the light provides.
It is the best to have the light spike between 350nm to 485 nm where 350 is close to UV, 400nm is violet etc