ow-pressure UV Lamp
Starting process: Filament preheating → high voltage pulse ignition → stable arc.
The ballast supplies low voltage to heat tungsten filaments to emit electrons.
1000~2000V high-frequency pulse breaks down mercury vapor.
After ignition, operating voltage drops to tens of volts.
Feature: Preheating is mandatory. Mismatched medium-pressure ballast burns out filaments quickly.
Medium-pressure UV Lamp
Starting process: Cold start without preheating.
3000~10000V ultra-high pulse voltage directly ionizes mercury vapor to form plasma arc.
No filament preheating procedure. Frequent start-up accelerates electrode erosion.
Key reminder
Ballasts for low-pressure and medium-pressure lamps have different startup logic and output voltage. They are not interchangeable.
