it should, as long as the socket is rated for at least 85W.

They fit standard bases(or Mogul bases if you buy them with the mogul-style base), but the ballasts are very large and you really cannot screw them into a socket with a reflector behind it without much modification.

Sam

Thank you for the responses. I was at HD today to look at sockets and they had some with different size metal reflectors behind them - up to 8 inches I think. They were clip-on type you use for construction. I had a 42W CFL at hand and it would fit, but I'm not sure if the topbulb.com 85W are larger than the 42W at HD? Do you think they will work?
Chris

I have a clamp-on reflector at home with my 42W bulb in it. Unfortunately, if topbulb's 85W is of similar dimension as my 80W Sun-lite bulb, it will not fit.

I ended up buying one of HD's outdoors light sockets(made of green rubber and plastic), and I cut about 1-1.5" off of the top of it and it fit just fine.

Sam

Sam,
So, for your 80W bulb you bought the socket with loose electrical wire ends? Do you use it with a reflector? If so, what kind?
Thanks,
Chris

Chris, I'm going to post some pics for you:

It was a pre-assembled outdoor lighting plug in a Y-configuration. I trimmed about 1-1.5" off of the socket where the plastic rose up and around the base of a standard incandescent bulb for a watertight fit.

I screwed the bulbs into them with my light hood in between, as you can see in the pics.

Sam

Chris. I have fitted all of my home with CFL's and have not found a socket that they will not fit. I am typing this under the light of 3x100 W equivilent lamps.They are in fact consuming only 23 wats each. The fitting was made for three 40 wat lamps so i'm getting 3X1600 lumens for the expenditure of 69 wats and as the fitting was made for 120 wats I don't think there will be a problem with heat build up. ( in case you can't guess I like a lot of light in the winter) Hope this Helps. Ps I also got mine from HD.
David.