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To: nihil who wrote (100695)	3/11/2000 12:32:00 PM
From: rudedog	Read Replies (1) \| Respond to of 186894

nihil - OT Wow!! Thanks for that info... I installed sodium floodlights in my yard as "canopy lighting" (mounted high in the trees, faces up and lights the upper leaves) to replace halogen. This reduced the power load from 4000W to 560W... the softer light from the sodium floods is much more pleasant, and with 24,000 hour bulb life as opposed to the 2000 hour Halogen life, I also won't have to worry about maintenance for years. The installer used white cotton gloves to screw the bulbs in - he explained that a fingerprint in the bulb would absorb so much energy that it could burn through the glass, thus the gloves. Those floods produce 6300 lumens on 70 watts for about 90 Lumens per watt, about in the middle of your range for high pressure sodium. The Halogens produced 7000 lumens on 500W, for 14 lumens per watt... I also looked at Mercury Vapor which also has long life but the blue light is kind of ugly and the light output is only 45 lumens per watt.

To: nihil who wrote (100695)	3/11/2000 1:52:00 PM
From: Road Walker	Read Replies (1) \| Respond to of 186894

nihil, OT Then again, you can get into photopic and scotopic lumens. This is much more important for indoor task lighting, but scotopic lumens are much more effective for human sight, with reduced reflection, better color rendition, increased contrast and some would say improved depth of field. In fact, the traditional lumen measurement as it depends on photopic lumens is totally misleading for the human visual system, but very accurate for reflected white (really noise) light which hinders human vision. Maybe this is more than we want to discuss. John