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High Intensity Discharge

What is the most efficient HID lamp in terms of expected lifetime and output in lumens per watt, but providing no color rendition (produces monochromatic yellow light)?
I. Metal halide
II. High pressure sodium
III. Low pressure sodium
IV. Mercury vapor
AnswerIII. Low pressure sodium. It is only suitable for security lighting applications.

ARE 4.0 exam prep: BS

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