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Some of my street lights!
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Rear row:
Sylvania R37 250w HPS, 1987
GE M250R 175w MV, 1975
Joslyn MV121 175w MV, 1960s?
GE M250A 100w MV, 1967
Westinghouse OV25TD 400w MV, 1976
GE M400 400w MV, 1961
On the floor:
Pemco clamshell, up to 400w, 1950s
Westinghouse OV25 first gen, 400w MV, 1960
GE Form 109, up to 400w, early 50s
GE Form 400 w/ glareshield, up to 400w, mid 50s
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The shaded Form 400, along with shaded Ovalites, Joslyns, and OV20s, was common on California freeways. If you want to see where this shaded Form 400 once lived, do a Google street view for 8327 Folsom Blvd, Sacramento, CA, since I can't get street view links on my cell. Anyone here is welcome to post a link!
And yeah clamshells did have shields! But I have NEVER seen FULL CUT OFF clamshell...has anyone (sorry refractorless don't count!)