This is self-ballasted MH lamp. Lamptech has one. Dunno about others.

Let me ask you where is this museum located? Would love to check it out myself.

That museum is in Washington DC I believe. Anyway that's a cool lamp, sadly GE never got to put the lamp in full production. They did make a few for sale, very few.

I'm gonna have to take a trip down there, as much as I hate going into DC!

I shouldn't say much, but Sylvania has self-ballasted CMH lamps available now. I know we have them in PAR flood and spot, and I wouldn't be surprised if they were available in other configurations. I think they are 24 watts. We're starting to use them in place of CFL's for certain applications.

As for the American History Museum, it's definitely a nice trip to make, plus it's free to get in. If you aren't thrilled about DC traffic and parking, take the metro. For a few bucks you can park and it will take you right to the National Mall / Smithsonian. Well worth it to me!

Spencer I know about the new CMH intergrated PARs by Sylvania. Philips has been making their version for a while, and many department stores here use them in place of halogen PARs.

Do some of you know, what ballast was there on this GE? As on the www.Lamptech.co.uk they mentioned, the "Filament helps to ballast the arc", what sound to me quite strange. The ballast is very simple as an electronic circuity, so no complex square wave, regulated power HID electronic used today as standard. And HF ballast (used for low pressure lamps) would not be DC...

The tungsten filament acts as a purely resistive ballast here, hence the rather low luminous efficacy. The bulk of the electronics simply provides the high voltage pulse necessary for ignition of the arc tube. The rest of the electronic design of the ballast is greatly simplified by operating the arc tube on a DC supply - two key units of the ballast architecture can be omitted when you run on DC. That made it considerably smaller and more importantly, also a lot cheaper. A full HF AC ballast remains rather expensive, especially when you have to use high temperature components suitable for building in to the lamp base. Note that the present day CMH-i lamps on the market cost at least double the price of the original GE Halarc.