Question for lighting experts
I recently bought a "dial a watt" ballast (250w & 400w) and for some reason, 9 times out of 10 it won't light a new 250w xm 10k bulb.
An old geiseman 10k bulb works fine on it and so does an old 10 xm bulb... The same new 10k bulb works fine on my old balllasts. This is starting to annoy me greatly, an ideas?
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