I know several people who have tried using LEDs to grow other things indoors here in northern california. They quickly switched back to HPS and MH lighting... the wave of the future... SULFUR PLASMA. This is old technology that is recently becoming more aplicable to everyday use as technology advances. It involves suspending plasma and argon gas then bombarding it with microwaves, which excites the gas and illuminates the bulb. Previously the whole bulb had to spin to suspend the gas, now they use a magnestic field. Also, i read that they just recently were able to fire plasma with just 15W! Thats a potential output of over 125,000 lumens with just 15w of energy used. Also they are now making them dimable so you can tune it down for more direct application (these things are sometimes used to light aircraft hangers and such in commercial application). Additionally, 3M has made a light tube that allows you to funnel the light down a tube, so the bulb does not have to be directly above what you are lighting, which helps with heat issues. I'm sure not applicable for aquariums yet, but the technology isn't far off.