I have sols, vega's and radions on my tank now and as for growth I would say they are equal. Now I would also say they are equivalent to the mh I used to have. I wouldn't go back to t5s or mh lights I love the led technology and the adjustability, and the old schoolers don't agree but they ride dinosaurs to work still :razz:

8 x T5s ( timer for each pair ) over my 75g and my SPS are growing well

RADIUMS

:pop2:

Hahaha

Radiums pound for pound are one of the nicest lights out there. They're just, you know, warm, and electrically-hungry is all!

Radiums not Radions :). Lots of money on fuzzy sticks - Radiums - proven over and over - no fuzzy sticks?, then Radions :)

I am kinda digging my Kessil right now, the sticks seem to like it a lot.

If I had a dinosaur to ride to work, I wouldn't be riding to work!! lol

Best light for SPS growth, Iwasaki 65k MH on HPS ballast. Best color, 400w Radiums. Best of all worlds, some sort of LED. Money being no object, I would go Vertex. If money doesn't grow on a tree in your back yard, AI. Sure, Radions are nice, and with adjusted price, maybe a better buy, but at the old double AI price, not worth it.
Kessils are nice, but comparable in price and coverage to AI Sol. AI Sol plugs into Apex controllers nicely, a good feature.
Not into LED, but MH too hot? Can't lose with all the available T5 bulbs out there. Some of the nicest tanks I've seen are lit with T5. The rest are lit with Radiums :)
A local guy is setting up a 12 foot tank with plasma, I'd like to see that once it's all done.