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@MTG#10 Mercury Vapor lamp is a type of bright blue-ish light used to be common in outdoor dusk-to-dawn security lights. They provided a light on the bluer end of the spectrum and had a higher UV output, so indoor growers would seek them out, but they were much more expensive and gave off much more heat than fluorescent grow lamps.
BTW: I am not a grower nor cannabis advocate. I was a lighting salesman.
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