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?
More efficient than white LED?
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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