Would a 250wat bulb and ballast work in a 600 watt refelctor?

I have had a major disaster and I need a new reflector quickly, the cheapeast ones I could find where 600 watt reflectors, will this reflector work?

Reflector wont matter unless the bulb wont fit in it. Ballast yes that will matter.

as long as the ballast and bulb match in watts you can use any e40 reflector