Archived posting to the Leica Users Group, 1999/09/23
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]From: Mark Rabiner <mrabiner@concentric.net> Sent: Thursday, September 23, 1999 01:17 Subject: Re: [Leica] Low Pressure Sodium > The most efficient form of lighting you can buy! The most efficient form readily available, perhaps. I don't remember which type of lighting truly leads in the efficiency rate--I know that metal halide and ordinary fluorescent lights are right up there, but supposedly microwave sulfur lights are even more efficient (although they are really weird). The big problem with LPS is that it is truly monochromatic. Tungsten is kind of orange, but still blackbody radiation, and with some tweaking you can adjust the color balance in a scan to make it look right, even with daylight film. However, in LPS illumination, there is literally nothing to adjust--you can't boost the blue channel because it's empty! All you can do is convert to grayscale, or tint the entire photo a different color. Really ugly if you originally wanted color. -- Anthony