Weird question - Look at my ballast

Hey guys,
I had a ballast laying around from a long while ago, but I'm a bit confused over the label on it. It says 250 Watt HPS/MH output on it, does this mean either bulb at 250 Watt will work with it? Or do I need a conversion bulb for either one that's a lower wattage? I included a picture of what's stated on the ballast box.
Thanks for any help!

250 watts hps....for mh youll need a 250 mh conversion bulb

Thanks, that's what I suspected but wanted to make sure! +rep

Are you sure it's not a switchable ballast?

look on the top; is there a switch saying 250HPS/250MH?

I have a switchable ballast. The switch says HPS one way and MH the other. Best of both worlds....

Hm, I wish that was the case. There's only one switch behind the box, and I'm guessing that's a power cutoff switch.

My ballast's don't have on/off switches and I don't know of one that does.... I could be wrong.

The model number is 250 watt HPS/MH. I think the switch is for HPS/MH.

I also noticed on the bottom there was a phone number and website. Call; they will have a customer service department to verify and provide documentation.

ballasts are usually turned on simply by plugging them in. any switch is likely the MH/HPS switch.