hmm, so the base is bigger than a normal lightbulb socket? it looks like what I was talking about, if it has a bigger base (mogul base is fancy name for screw-mount, they come in 3-4 sizes; just to make sure we're on the same page here.), it usually requires something "special" is what I'm saying, I know the 85w screw in CFLs work well and they're only $8-9 bux/per at homo depot. the larger screw-in ones (look just like the product you showed me) go in mercury vapor fixtures and were like 25-30 bux/per. I'm high and am over-thinking here...... toke..... toke.... buy it, if it don't fit, return it.