This and other neighborhoods in this area was full of those Westinghouse MO-8 and a few GE M-100s! The main road of those MO-8 lit neighborhoods (I mean plenty of several groups of neighborhoods with those) were lit with Westinghouse OV-12s and Silver GE M-400s!!!
I've seen longer rows..... In this area alone, there must have been like 25-50 of them......I am not sure though...didn't go through whole or all of the neighborhood
It was before low wattage mercury vapor was popular...a lot of electrical companies were still using incandescent for smaller roads, residental roads, any place that was lower wattage (at that time (late 50s and early 60s) the 400 watt MV was very common but not the lower wattages...
So in the early 60s they made the cheaper models to encourge electric companies to switch from incandescent to MV.....sso the fixtures were cheaper......but ballast quality was the same....just removing the glass made it cheaper....and a few redesigns........but they still last long time....those are from 1962-1965..........in my area under BGE the open bottoms are ONLY 100 watt MVs.....but later days when the open bottoms were discontinued...BGE began using Westinghouse NEMA heads instead of open bottoms for 100 watt in residental and small roads....by around mid to late 70s they stopped using NEMA heads and use regular 100 watt cobraheads.....
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What was the point of the open bottomed ones? Didn't they corrode on the inside?
So in the early 60s they made the cheaper models to encourge electric companies to switch from incandescent to MV.....sso the fixtures were cheaper......but ballast quality was the same....just removing the glass made it cheaper....and a few redesigns........but they still last long time....those are from 1962-1965..........in my area under BGE the open bottoms are ONLY 100 watt MVs.....but later days when the open bottoms were discontinued...BGE began using Westinghouse NEMA heads instead of open bottoms for 100 watt in residental and small roads....by around mid to late 70s they stopped using NEMA heads and use regular 100 watt cobraheads.....