This I think is the coolest part of the whole fixture! The photo is not the best but... As you can see 100w, 150w and 200w are marked on the inside near the top. By each wattage is a screw hole, so if the bulb you would like to use is 200watt than you would screw the socket to those holes. Each wattage has a different height so the light is distributed evenly. It is a really cool feature!
Yes this is COOL! I have a similar thing in those two fixtures. What they have is a ring socket holder that flips...one side is for 200 watt incandescent or 100 watt mercury vapor for PS-21 shape while the other side is for 150 watt PS-19 lamps! So it is a similar design, but you have to flip a socket holder ring depending on the size and wattage and type of lamps! Yep you guessed it, those 2 holophane fixtures are made for incandescent or MV lamps, MV lamps actually does not need pulse start rated sockets! If they were MV, (which one of mine has become) they would need a post type remote ballast!
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