Metal Halide lighting

[Z-man]

I'm looking for a little help with a flickering metal halide light. I am using the Outer Orbit Nova series lighting with 3 x 150 watt 10K double ended bulbs. The light is flickering now. I have tried changing bulbs that turned on for a few minutes then started to flicker also. My guess is a ballast, but hopeful it's something a bit more simple. Anyone have any advice or direction?

 

[condor]

probly the ballast but you could try cleaning the contacts(after you unplug the light)