Friday, January 1, 2010
The Pollution Al Gore Never Talks About
It is reflecting the High Pressure Sodium light. HPS is getting to be a pollution - it is everywhere. Look around at night little patches of red-orange everywhere. See the orange glow of cities.
I don't remember the first time I saw High Pressure Sodium light. I do remember the first time I saw low pressure sodium (which is even redder). That was in 1967 lighting a parkway in Dallas, TX. It looked so strange - especially from the air. This red strip through town.
By 1967, mercury vapor had been around for a while, but even then most street lighting was incandescent. When you did see a mercury vapor light, it was unique and people took notice. High Pressure Sodium street lighting began three years later, in 1970. In the following 40 years it became omnipresent. No one notices any longer even though there are bright orange skyglows over every city and town in the nation - perhaps the world.
Perhaps over the generations we will evolve to adapt to HPS, but to this generation, orange just does not seem to be the way the night should be.