Greetings all, I can't speak to lights other than my new Ocean Revive, 2 channel royal blue and whites/red/green/UV 55x 3 watt Chinese light with timers, but to it, I can. For $150 its unbelievable. I have a standard 75 gallon with light 11" off the water it more than covers the half of the tank it is supposed to. Before I had a wee bit of hair algae growth (lunare wrasses are not good for maintaining a healthy clean-up crew by the way...) I had the blue channel at 15% and the white/colors channel at 5%. I cant say for sure on total depth penetration for clams yet given I dont have one, yet, maybe when dtanarath comes over and we stop in to see Carmine at Coral Reef and Frags, but I can say, if turn them up to get the par at the bottom, you might bleach something at the top. THEY ARE REALLY BRIGHT!
The picture is with only blues at 5% for dawn/dusk and moonlight when i feel like looking st the crazy color corals under actinics ;-)
Hope this helps