Where did you get that? Nice fixture here!

nice fixture ! you could get a mogul to medium socket adapter, they're ceramic, not pulse rated , but should be fine anyways.

Jace, I got it on eBay from seller Surpluscityliquidators. According to the listing, they have over 1,600 of them in stock.

I saw lots of these on ebay as well. I was searching for a glass refractor and found tons of them. Do these have a refractor that comes with them?

By the way here is a link to one:
(different seller, but same thing)
CLICK HERE PEOPLE!!!! :3

The one you see is a 100 watt Cooper HPS NEMA head....i can tell by the socket which is close to the Westinghouse design (they actually still make Westinghouse original design too! And I see the square ignitor too!

Hey Jace, Try This Link.

The same seller also has some refractors listed too, but it's the screw on type.

Yup, that's the one I got! I also saw the refractor, but as you said it's screw-on.

Don't exactly need one....I kinda have one...although mine is a bit older design...but I am getting another one that's even older than what I have....the one online is the newest one...

Nice light. I've wanted a 100w mercury vapor GE 201SA for awhile now. I just have to be paitent and wait...... I know I'm getting a light fixture on my birthday on 5/6, but I don't know if it's a LPS or if it's a 100w MV M-250A2 FCO, which I had also wanted because that's what was installed here before the HPS change over on residential roads in the late 80's-early 90's.