You can get dimmable MH...
http://www.youtube.com/watch?v=U0CdJS_9Sy0

Holy grow op batman!

I don't think you can beat MH, Imagine 2 400 watt MH over a 200 GL, wow but I just can't do it why, Costs, Heat, Glare, I have 2 Maxspect Razors over my 150 and They don't make a difference to the Fish that's for sure. The Corals seem to be happy, nice and bright, But what I enjoy is the Lack of heat, Lower energy cost, No difference in spectrum for awhile and they were affordable.

I hear people say you can have SPS with LED, that's a crock sure you can, They are bright.

Should that say "can't"? :)

oops you got me, LED is where it's at, For now anyway

Pretty happy with my SOLS though. Used to run a huge MH fixture over my 240 Gals. that I got from another member here. MH used to run freaking HOT all the time, the fans that I installed on it were freaking LOUD too, well my fault for buying cheap fans but anyhow, I did the switch to LEDs and MAN, what a difference in costs, temp, noise, etc, etc, etc. At the beginning my corals had to go through an acclimation period. In about a month or so, all my corals were happy once again. Fish? they didn't even notice I think. For the control you can have on these LEDs units and the all other features they have, it was worth the change for sure.

Pretty much sums up my thoughts on the switch.

Do people really still say this?! People have been growing SPS under LEDs for years now. Some people really need to get out from under their rocks :lol:

according to the description and what we're seeing that's not true dimming but your typical select-a-watt ballast where it has multiple power settings.

For true dimming the only one i know of that's readily available is the Sfiligoi ACLS system.

http://www.3reef.com/forums/3reef-ra...goi-47867.html

And regarding shimmer, my tiny Kessil a150 LED has more shimmer than my 250w halides had! Fixtures using many separate 3w chips don't produce the same shimmer as the cannon style pendant though.