That would equate to 1560w on a 120g!!!!!!!!!

hardly, would not be adding up like that.

depth has more to do with anything then full volume. thats why watts per gallon is pretty useless as a measurement.

my tank is 3' long and 8" deep, I can grow just about anything without worrying about depth. If this light was say over a 40 breeder which is twice as high, would you be growing sps on the bottom of the tank? by growing I mean thriving, not just living.

Got any pics of your tank?

ill post up pics in the build section n let ya know. be awhile yet... this little tank just got finished building 2 months ago, this is replacing a 10" deep by 4' long that decided to **** all over my floor.

Binare, I like the idea of doing your own lights, sounds good I look forward to seeing some tanks shots also.