I'd say it depends, but the basic gyst is yes it compares. The thing with T5's is you can cover the square footage of the tank with lights, so it's a pretty even intensity.
In the whole T5 vs halide question I don't really consider one better than the other. I like both, I don't really think one trumps the other in all scenarios. At $25 per lamp with 4 of them, for example, the cost of a complete lamp change-out is pretty much the same as replacing a halide.
Ran 4x24w over a 20g for a while and was able to pretty much keep anything in that tank.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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