MH ballast question

[GreenSpottedPuffer]

I have a ARO Electronic Metal halide Ballast LMH 120-250 watt sitting around. I want to know if its possible to use this with a lower wattage bulb? I think I would like to use a 150 if possible...maybe a DE 150? I have a feeling the DE needs a different ballast but Im not sure. I have no idea how these things work. Is there any other info from the ballast you would need to figure out if its possible?

Basically, what type and wattage bulbs are ok to run off this ballast?

Thanks!