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Custom Enclosed Ballast
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Took a 50w MH ballast I had lying around and installed it in this aluminium project box to make this enclosed ballast. It's currently used with my 75w Eye Merc in my Powerlite gumball. I didn't want to modify the gumball nor the ballast above the lamp so I remote mount it in this custom box. The ignitor is installed but wired out of circuit.
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Apparently you can use a inkjet printer to print on aluminium but you'll need to coat it with a coating to absorb the ink before printing.
Still looking for a cheap magnetic 39w CMH ballast for running 50w MV lamps, they seem to be quite rare. All of mine are electronic which you can't easily disable the ignitor on. Electronic MV ballasts exist though, I have a 80w fixture that has one.