Cooper/Crouse-Hinds
Two Crouse-Hinds L150s.  The one above carries 100-watt HPS lamps, while the larger model at right is 400-watt HPS.
Two of Crouse-Hinds' most popular fixtures, the OVS (above left, 250-watt HPS) and OVM (above right, 400-watt mercury).  They have since been replaced by the Cooper OVZ and OVX, respectively.
More Cooper/Crouse-Hinds Photos:

OVD (semicutoff), 250-watt metal halide
OVF (full cutoff), 250-watt HPS
OVG (cutoff), 250-watt HPS
OVH (full cutoff), 250-watt HPS
OVL (semicutoff), 1000-watt HPS
OVX (semicutoff), 400-watt HPS
OVY (cutoff), 400-watt HPS
OVZ (semicutoff), 175-watt mercury
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