for Osram Germicidal UV OEM Replacement bulb for ELGA LabWater OR015BPM1 Osram UVC (germicidal) lamps are used in professional water and air disinfection units. The compact size of the lamp allows for a small system design and design flexibility. Osram germicidal lamps offer almost constant UV output over their complete lifetime for maximum security of disinfection and high system efficacy.