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Shot Out Light
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I remember seeing this dayburning very very dimly when I was in Brazil back in 2006. As greened out as a MV can be. Until someone decided he had it with the dim greenish light and decided to shoot it out.
The brown square thing near the arm's base is the ballast for the light.
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Interestingly in Southern Ontario the frequency used to be 25Hz and some early fluorescent lights here had dual mode 25Hz and 60Hz ballasts. I'd hate to be working underneath a 25Hz fluorescent light though.
Oh, and mercury vapor is still available according to that site.