Calgarypuck Forums - The Unofficial Calgary Flames Fan Community - View Single Post - Holy crap! White Street Lights in Calgary! OMG!

Cheese · 08-31-2012, 02:28 PM

I would think that the yellowish lights you are referring to are HPS or High Pressure Sodium. They are likely being changed out to MH or Metal Halide, white color,...or perhaps to LED.
I doubt they are the dark orangy color or LPS Low Pressure Sodium, those were banned (changed) years ago and I cant remember Calgary utilizing many of those if at all for street lighting.
Light pollution wasnt fought by lamp color, it was/is being fought by less fixtures, and better shrouds. The HPS has longer lamp life and better lumen output.

08-31-2012, 02:28 PM	#22
Cheese Franchise Player Join Date: Mar 2002 Exp:	I would think that the yellowish lights you are referring to are HPS or High Pressure Sodium. They are likely being changed out to MH or Metal Halide, white color,...or perhaps to LED. I doubt they are the dark orangy color or LPS Low Pressure Sodium, those were banned (changed) years ago and I cant remember Calgary utilizing many of those if at all for street lighting. Light pollution wasnt fought by lamp color, it was/is being fought by less fixtures, and better shrouds. The HPS has longer lamp life and better lumen output. Last edited by Cheese; 08-31-2012 at 02:35 PM.