It this a good light?

[mqktandy]

I was suggested this light by a local guy who frags corals out for stores was wondering if anyone had used one
http://www.aquatraders.com/24in-Metal-Halide-HQI-T5-Aquarium-Light-p/54261.htm

 

[dgk9723]

I have the 18inch and I like it. That one is a new model and I bet it's worth it.

 

[mqktandy]

Do they use external ballast? And how do the moonlights get turned on?