I recently swtiched from MH
. I couldn't be happier. I got the PacificSun BT EX units (1 master/ 2 slaves) for my 6' tank. The LEDs are fully controllable. Right now I am running them at 62% power, but as I add more corals and they get acclimated I will ramp it up. At that point I will set the 40 waypoints for sunset rising to a noon sun and dropping down to sunset. At peak these will produce the equivalent of 400w MH
without the heat.
Since adding the LEDs I no longer need a fan to cool the tank. The tank stays at a consistent 79 degrees and I am using much less top off water, not to mention the cost saving on electricity and not having to buy new bulbs every year.
I just read that LEDs do not produce light in the yellow-green spectrum that cyanobacteria (red slime) loves, so LEDs can eliminate that problem too!
I'll be posting a full thread on my installation soon.