Will mismatched power between ballast and lamp affect luminous efficiency

Overpowered ballast matched with low-power lamp

Excessive current turns most electric energy into heat instead of UV radiation. Black tungsten deposits on tube ends and aged quartz glass block ultraviolet rays, leading to sharp efficiency drop.

Underpowered ballast matched with high-power lamp

Unstable flickering arc fails to convert electricity into UV efficiently. The lamp works outside its optimal current range, resulting in insufficient radiant output.

Summary: Only matched rated power enables the lamp to operate at the designed current and temperature, maintaining maximum luminous efficiency and stable disinfection performance.