Streetlights
Streetlights can’t be on a motion sensor, because the metal-halide or sodium lights take a few minutes to warm up, and turning them on and off burns ‘em up.
We’re replacing city street lights with LEDs now; they use far less energy, and a bulb will last ~25 years. The other change we don’t seem to be making use of is that those lights can be rapidly cycled; an LED plugged into AC power turns on and off 120 times in a second.
So why not put LED street-lights on motion sensors, so that they don’t turn on unless *someone* is moving on that block? We’d save a *ton* of energy after midnight and before dawn, right?
Originally published at Dean's Log. Please leave any comments there.