Can I use motion sensors with high-pressure sodium and metal halide lamps (HID) to reduce outdoor lighting energy usage?
A – HID sources can work well in conjunction with motion sensors that offer two levels of lighting (also called stepped ballasts or hi-lo). In these applications, the low level light is provided (50% power and 30% full light output) when no motion is detected. When the motion sensor detects motion, it triggers the lighting to go to the high light level. The hi-lo lighting may be appropriate in parking lots, parking structures, and in areas where safety and security are important. Do not use motion sensors with HID lamps in an on/off mode, since the long warm-up time precludes a practical application.
Hello, unfortunately I am not an engineer to help you with such equations, but I can tell you that there are another way to save money on electricity. Instead of using those motion sensors, that can be effective, I don’t deny that, but those sensors shortens the life of your bulb, because they turn on and off your light a lot of times per day, and that can affect a lot the lighting bulb. That is why I suggest you to buy a LED light, it lights better, cost less, and you can leave it on all the time.