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GE Halarc 32w metal halide
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Tiny quartz arc tube in this lamp that I don't have a ballast for. The arc tube has the protective shield around it for open fixtures and is designed for vertical base up burning only. It has only a diffusing coating, not a phosphor. I believe this was the first size of the low-watt pulse-start lamps; it shows up in my 1987 GE catalogue. It also says the lamp has a minimum starting temperature for 50 Fahrenheit, so it wasn't intended for outdoor use.
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