Quote Originally Posted by sharkboy
I am currently running 3 - 400w 14k bulbs from hamilton....I have considered getting a 10k bulb for more growth...could I put the 10k bulb in the center while leaving the outer two as 14ks?
You don't say how large your tank is. My impression of MH is that the light is most intense 9" from center, an 18" circle. If you had a long tank like a 125 I'd think only the corals in the middle would benefit from the 10K growth. Now if all that was packed over a 75g I'd say you'd be supplementing your lighting in many spectrums and your corals would benefit from both types of bulbs.