


thanks for your help
That appears to be a magnetic ballast, of which there are 3 types. Because it says 150W, it should be the correct ballast for a radium lamp which is an "HQI" (actually incorrect name, but that's the name in the trade).
If you could open it up and get the numbers/markings on the ballast you could be more sure, but that's probably the right one.
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