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[Wrybread]

I bought a Telex Caramate 4000, which takes a DDM bulb (80w @ 19v). That bulb died, and I had another bulb on hand, but its much higher power: EJV, which is 21v @ 150w. I put it in the projector and it works fine. The slides look brighter, and I

[Scanogram]

The problems you could encounter are overheating and you could also damage the wireing, the new bulb draws almost twice the current.

[Richb]

I just checked the Sylvania Photo and AV cataloge (1986).  There is no listing for a substitute for the DDM.