Each. Remember, they were "conversion" bulbs. Extra. But still cheaper
than buying a metal halide lamp AND a metal halide ballast of that quality.
These were old military fixtures, made in the early 80s, and still (but
one) running on the original ballasts. I have one spare ballast left.
THEN I have to spend real bucks.
On May 18, 4:08 am, "Lloyd E. Sponenburgh"
It is my understanding that these sodium lights produce light that can
easily be removed by the astronomers. In other words, remove the
normal 'glare' from a nearby city.
When first proferred the manufacturers touted how these 'harsh' lights
used in parking lots lowered crime rates, because felon minded perps
couldn't stand the light. Wish I'd saved a copy of that!
These lights DO remove color from view. Once at night, I parked my car
along a clearly painted RED CURB fire lane, because in the light from
these sodium lights the red curb lost ALL color. I checked when I
parked, no red curb. When I fought the ticket, the judge said I should
rely on the signs to tell me not to park there, which were only 40
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