Philips 285650 TUV PL-S11 watts Single Tube 2-pin G23 base UV-C 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 constant UV output over their complete lifetime Thanks to the single-ended lamp base, lamp replacement is easy.