The three bigger cfls are 85watts and the smaller ones are 23w. Performance wise I love em, they penetrate alot better than the 23s, as for your 42s im not sure if the difference would be huge. I would imagine a 200 or 250 would penetrate amazingly just not sure of how hot, the 85s don't really get much hotter than the 23s honetly so I wouldn't think 200w would be much hotter.