I've read just the opposite ,
More often than not most posts / threads I've read claimed M/H ran hotter than HPS - but I'm not sure if these folks were talking std M/H or conversion ? I can't speak from exp. on this 1 . I run hortilux HPS start to finish . A conversion bulb for my lil 250w HPS costs what a bulb for my 1000's does so I've never messed w/ conversion bulbs .
Peace
Crispi :jointsmile: