Did you know that there are 35,000 street lights in London?
These lights can be broken down into three major categories:
21,000 Cobra style (fixture is on an arm extending over the road), 70 watts to 400 watts
13,650 Post-top style (used on most residential streets), 70 watts to 150 watts
350 Other (pedestrian globes, wall mounted, etc.), 70 watts to 250 watts
Most street lights are high pressure sodium (HPS); however, light emitting diode (LED) lights have been tested and are being used on new street light projects.
The first phase of the LED Street Light Upgrade project is complete. Just over 9,000 HPS fixtues have been replaced with LED fixtures. Energy consumption for these fixtures has been reduced by 55%. More information on the Transportation Energy Optimization Program can be found here.