I can't speak long term yet, but already 3-3 1/2 months into leds as Marko said, I have wicked growth on everything compared to 6 months with T5's, it is short term, but I believe it is a testimonial to the growing power of LEDs
EDIT
The colors are also a million times better as well, and LEDs aren't going to brown out your corals like MH will
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I'm not 'fallow' you must be talking about my tank!
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