Philips 325126 9 watts Single Tube 2-Pin G23 base TUV PL-S UV-C Light Bulb TUV PL-S lamps are compact UVC (UV-C) lamps. The compact size of the lamp allows for a small system design and design flexibility. TUV PL-S lamps offer almost constant UV output over their complete lifetime Thanks to the single-ended lamp base, lamp replacement is easy.