Friend of mine and I are going to be converting some of our respective SPS tank's supplimental lighting to LED's. The PAR numbers to get what we have running in the 14K bulbs is not effective or should I say hard to reach with LED's for a main light source. Read the numbers, seen the actual tests and it's not going to happen. But supplimental or for softies or nem and fish only should be fine. I believe there are other limitations in spectrum where the LED's cannot hit across the board portions of the spectrums. A trend which leads me to believe they are for making the blue colors we like, but you still need full spectrum coverage that only halides, T5's and VHO's can deliever for main light sources. It will be a long time coming before I try that experiment on 5 years of SPS growth. Unless they can come up with an LED with 10 watts of output for 5 watts of power consumption? Otherwise for main lighting the LED's required to get where I would need would equal the consumption of my Halides. The PAR just isn't there. But my power reduction for replacing my supplimental lighting with LED's would give me a savings on electrical operating expense of about 700 watts less than I'm running now. It's a good start.