Philips 9-watt PL-S TUV PL-S Compact Fluorescent Non-Integrated (CFL-ni) lamps are compact UVC (germicidal) lamps used in residential water and air disinfection units. The compact size of the lamp allows for a small system design and design flexibility. TUV PL-S lamps have a protective inside coating that ensures contact UV output over their complete lifetime for maximum security of disinfection and high system efficacy. Thanks to the single-ended lamp base, lamp replacement is easy.