I presume mine is 300W judging from comparing the size of my unit with what I see on youtube videos. Quite honestly I've used it very little over the years - find it starts to attract bugs pretty quickly for one thing. Since the pool is over 30 years old, and nothing has ever been done with the light - is there a possible concern about a gasket, etc. deteriorating that could let water into areas where it shouldn't be thereby creating an electrical hazard? I've never had it out so frankly have no idea what the whole thing looks like. If I saw it being installed I don't remember much about it. Just used the light this evening for awhile (since it's been years- pretty cool actually since probably like many of you I have different colored plastic lenses that fit over the top). Got me thinking though - is there a potential hazard? I always keep the breaker turned off that supplies power to the light switch. Bulb still works fine so I guess no need to do anything unless something should be checked for potential deterioration. Thanks for any thoughts.