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Prune 4th October 2003 01:16 AM

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?

purplepeople 4th October 2003 01:17 AM

More efficient than white LED?


Prune 4th October 2003 04:17 AM

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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