Re: Yellow street lights
Date: February 14, 2015 06:19AM
Sorry for going a bit off-topic here...
the longer fixtures you mentioned most likely were having low-pressure sodium lamps inside . These are long lamps (1 to 3 feet, depending on power) and give off a deep, mono-chromomatic orange/yellow light. Low-pressute sodium lamps are even more efficient than the compact, high-pressure variety. These lamps can still be seen in Chicago on several elevated CTA platforms as well as under some expressway underpasses. At turn-on, these lamp first burn bright red for around 10 minutes before turning yellow. Sheffield avenue in Hammond -just across the Il/In statline still has a whole bunch of them.
the majority of outages of new installed lights are not so much due to fixture faults but due to old, neglected wiring infrastructure. Early 2011, I was part of a troubleshoot team to investigate outages at S. Western and N. Lake Shore when the city of Chicago had the new "white" discharge lamps + fixtures installed. A considerable amount did not work, sometimes a whole block was out. We found blown fuses, snapped overhead wires lying on the sidewalk, loose wires broken by nearby tree branches, wires having damages insulation inside the pole and faulty dusk switches. Some poles were live and thus dangerous to touch! Most of the -hamfisted- electrical infrastructure dates back to the 50s/60s but the harsh Chicago climate is able to wreck everything if given enough time...