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HO Troffer Opened Up (More :P)
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Here's a shot of this with the ballast cover opened showing the two huge HO ballasts inside. I guess it's recessed quite far into the ceiling to fit the two HO ballasts. Note that the ballasts are actually above the lamps instead of beside the lamps under a U shaped cover like on most troffers.
Shot is a bit blurry...had to use my phone camera.
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The subway here is filled with a lot of interesting lights though, including mercury Powerlite B2217s and B2215s, Unistyle 175s and 400s from the 60s. Old mid 50s preheat lights and troffers (since converted to T8 ), and some old preheat signs. Some stations still have some old 120v incandescent emergency lights too.
Yeah the ballasts are quite hefty and I think they are GE ballasts.
-------[05 Apr 2013 at 00:23]-------
I've seen the crews relamp the F32T8 lights but not the HO troffers. The subway here has some other interesting fixes too, including this fallen troffer (since fixed and the ceiling put back), recessed 50s Crouse Hinds incandescent step well lights with a piece of plastic screwed over the broken glass/missing door with a CFL inside, CFLs in vapour tight fixture (only a small number though), trains with flickering/out lights, trains with LED retrofit tubes.
Anyway, there's still some HO troffers that could use a relamp in the area but I'm not sure if they're waiting for the construction in the station to finish before finishing off the relamping.