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Inside the GE M400R2 310w HPS light
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Here it is, it has a huge 3 coil ballast that Caltrans, the California highway department, likes to use. It is multi-volt from 120v to 277v, set at 120v. The center coil is connected only to the capacitor, the third coil is connected to the lamp and ignitor.
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This has a Regulated lag ballast, and because of that the ballast needed different brackets from the usual due to the fact the ballast is BIGGER.
But I say this M-400 R2 was a nice score!