400 watt m59?

Yes,but your limited on bulbs.Because of the bulb pointing down in that fixture.but other than that the m59 is a great ballast and will run most bulbs.
 
so it would be smart to go ahead and get the ballast and just replace the reflector and socket. I can get a couple of the ballast by themselves. They are also "suitable for moist conditions"
 
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