I'm guessing they're efficient because their near monochromatic output is near the peak sensitivity of the human eye, so the comparison should be done with yellow LEDs.
Hoyt -----Original Message----- From: AlanG [mailto:a...@magicsound.us] Sent: Saturday, February 15, 2014 2:17 PM To: vortex-l@eskimo.com Subject: Re: [Vo]:X-prize proposal Sodium vapor lamps are apparently the most efficient light source commercially available, which is why they're widely used in street lighting. At 200 lumens/watt, they are about twice as efficient as typical LED lamps, and have about half the service life. Their construction uses borosilcate glass with a vacuum thermal insulation envelope. Sound familiar? A discarded bulb might make a good core for a Celani cell. AlanG ref: http://en.wikipedia.org/wiki/Sodium-vapor_lamp On 2/15/2014 12:08 PM, Eric Walker wrote: > Another kind of light source I really have a hard time with is sodium > vapor. San Jose, which is just a 45 minute drive from where I live on > a good day, uses this for their street lamps. --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com
