Why do HPS streetlights seem to take a long time to turn on?

I want to buy a HPS street light, but I heard that it takes a long time to turn on. What is the reason?

Under normal working conditions, the startup process of high-pressure sodium lamps takes about 10 minutes. When the HPS lamp is connected to the power supply, the current passes through the ballast, thermal resistor, and bimetallic moving contact to form a path. At this time, there is no current in the discharge tube. After a while, the thermal resistor heats up, causing the bimetallic thermal relay to disconnect. The ballast coil generates a high self-induced electromotive force at the moment of disconnection. This ionizes and discharges the nitrogen in the tube. The increase in temperature, in turn, causes the mercury to turn into vapor and discharge. When the temperature inside the tube further increases, the sodium also changes into a vapor state, begins to discharge, and emits strong visible light.

More reading: LED Street Lights VS HPS Street Lights: What’s Better in 2023?

What Others Are Asking

Why is my dimmable LED street light so dim?

I bought a 150-watt LED street light, but whenever I turn it on, it dims down a lot. There isn’t a controller for the light. What are the possible reasons?

Read Detailed Advice From Blog Articles

Scroll to Top
Scroll to Top