Manufacturers originally designed double-ended high-pressure sodium light bulbs so they would be compatible with double-ended metal halide fixtures. Traditional single-ended high-pressure sodium bulbs already had the industry seal for being the “most efficient white...
from
http://feedproxy.google.com/~r/HIGHTIMESMagazine/~3/NH2SC8wf59w/why-are-double-ended-high-pressure-sodium-bulbs-better-single-ended
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