These bulbs are for low pressure, high-output lamps for general disinfection (254 nm output), BLUE base, 10,000 hour life.

Dimensions

L210C - 8.3" (210mm)

L330C - 13.0" (330mm)

L420C - 16.5" (420mm)

L600C - 23.6" (600mm)

L950C - 37.4" (950mm)