Metal halide lamps produce
a bright, white light with fair color rendition, have a lifetime of
about 6,000 hours, and are more efficient than mercury vapor
lamps. Mercury vapor and high-pressure sodium lamps have
poorer color rendition but longer lifetimes (16,000 to 24,000
hours). Mercury vapor lamps have an efficacy of about 50
lumens per watt, while high-pressure sodium lamps have an
efficacy of 50 to 140 lumens per watt. Low-pressure sodium
lights are the most efficient and have long lifetimes (12,000 to
18,000 hours), but they have very poor color rendition. HID
and low-pressure sodium lights require up to ten minutes to
start and have to cool before they can restart, so they are most
suitable for applications where they stay on for hours at a time.
They are not suitable for use with motion detectors.
Metal halide lamps produce
a bright, white light with fair color rendition, have a lifetime of
about 6,000 hours, and are more efficient than mercury vapor
lamps. Mercury vapor and high-pressure sodium lamps have
poorer color rendition but longer lifetimes (16,000 to 24,000
hours). Mercury vapor lamps have an efficacy of about 50
lumens per watt, while high-pressure sodium lamps have an
efficacy of 50 to 140 lumens per watt. Low-pressure sodium
lights are the most efficient and have long lifetimes (12,000 to
18,000 hours), but they have very poor color rendition. HID
and low-pressure sodium lights require up to ten minutes to
start and have to cool before they can restart, so they are most
suitable for applications where they stay on for hours at a time.
They are not suitable for use with motion detectors.
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