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Outdoor lighting

Commonly used outdoor lamps are metal halide (MH) and high pressure sodium (HPS). LEDs are also increasingly replacing them in outdoor applications, such as pedestrian path lighting. The quality of light differs among lamp types and is an important selection criteria considered with efficacy, efficiency, lamp life, and initial cost.

Match the light quality with a lamp type:

I. amber light II. white to bluish white light III. warm white
1. MH 2. HPS 3. LED (3000K)

A. 1=I, 2=II, 3=III
B. 1=III, 2=I, 3=II
C. 1=II, 2=III, 3=I
D. 1=II, 2=I, 3=III




D is correct.
Kelvin scale, at 2000K-4000K is warmer (yellowish), while 10000K becomes cool white or bluish.
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