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 ...
Alliant Energy had been studying replacing the high-pressure sodium light bulb casting a yellowish-orange glow on downtowns and residential streets around Iowa with a more efficient, brighter white ...
CEDAR RAPIDS - Alliant Energy has begun to replace the first of about 12, its high-pressure sodium streetlights with LED ones here and in 58 other communities in its Cedar Rapids metro service area.
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