I know this question is very subjective, but if anybody has some insight or experience, I'd appreciate the help.

The only time I've used LED's are for blue supplimenting and I usually leave them on for 12 hours. I now have 4 units of 120w 3w x 55 Bridgelux 27 blue and 28 white over an 8' tank with anemones and softies.

I plan on running the blues on 12 hours again, but how long do I run the whites along with?

Also, I'm wondering how low above the water to hang these things.

Thanks,
Tom