Hey folks, I've got a Durst Varipoint (point source lamp) for the 138S, but no bulb. Checking out the usual suspects has yielded nothing. Does anyone out there know what would be the correct - or at least, suitable - bulb for the Varipoint? I've got the 2 1/2" adapter socket from standard Edison base to a dual pin bayonet. Varipoint output is 20V. Thanks for any help!