This is two 250 watt MH radium 20k, with 3 kessil a360x. My ballasts are old school hqi close to 30 years old and still going. Only run halides 4 to 5 hrs a day. Buls change once a year, and could go longer. Just bought radium for $140 for 2. For super light demanding sps 400 watt halides would be best. If I switch out halides, I think i would pick either orphek atlantik, meridian, or maybe the new ati straton. I would keep the 3 kessils just for the shimmer and evening viewing. The other lights are for day light growing and sps coloring.