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Old 4th October 2003, 01:16 AM   #1
Prune is offline Prune  Canada
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Default Portable LPS

Since low pressure sodium is the most efficient light bulb, I've been trying to find portable versions I can use as a flashlight, with no success. There are ones that run on 12V DC but are too large and with too high wattage to be used as a flashlight. Are there any really low wattage LPS bulbs?
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Old 4th October 2003, 01:17 AM   #2
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More efficient than white LED?

:)ensen.
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Old 4th October 2003, 04:17 AM   #3
Prune is offline Prune  Canada
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Are you out of your mind?

white LED: 15-25 lumens/W
halogen: 25 lumens/W
HID (mercury, etc.): 30-40 lumens/W
red LED: 40 lumens/W (there is a special one around 100)
fluorescent: 60-100 lumens/W
HPS: 100-150 lumens/W
LPS: 175-200 lumens/W
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