I have a 120g its 60lx18wx24h and have a diy led on it. 64 royal blue, 64 white. I use luxeon rebel 3W running at about 75%. They seemed the best at the time. This seems to be enough for my few SPS. They are starting to grow from frags decently. My zoos dont seem to like it though as they dont really grow, some just melted away. That might be an unrelated issue though. Frogspawn loves it, torch not so much. I have no optics and about 4 inches from the water.
With LEDS it not so much the watts -as you stated- but the par values. Im still tweeking mine to see what works.
If you have very basic electronics abilities and time you can easily make your own DIY setup. It just takes patience and creative ability. Its very fulfilling and impressive to say you made it.
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