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Username power bracket
Joined Mar 13, 2012
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03/16/12 at 16:22McGraw Edison was the original manufacturer of these fixtures. Line Material Industries bought McGraw Edison in the 1970's and the ballasts used in these early models were 175 mercury vapor lag 120 volts NPF and "LM" part numbers on them. I have two McGraw fixtures dated 1978 and both the ballasts are Line Material OEM parts bobbin wound with 3/16 in QC' terminals. Cooper Industries acquired McGraw Edison in the 1980's and kept building this design under the regent name but with aftermarket ballasts, mostly Advance transformer