In my frag tanks I like 6500K MH - Nothing grows coral faster. Not for showing just growing
In my display tanks I'm old school w/ VHO
Not real impressed w/ LED yet! But they will become the lighting of the future as they already provide some nice variable controls. We just need to get the nm configuration worked out. Right now I am experimenting with a combonation of two blues to every one white and alternating the white w/ daylight white and soft white. In addition every fifth white is replaced by one red. In a 15 diode array I have 10 blue diodes, 2 daylight diodes, 2 soft white diodes, 1 red diode. I using the cree 1.3 w/ reflectors to simulate 3.9 watts traditional from each diode or 58.5 watts per array. I have three arrays for a total of 175 watts on a 40 gallon breeder mixed tank w/ all frags. I'm only three months in so i'll have to get back to you on what i think in another 9 months.
Merry Skerry