"Philips MASTER Actinic BL TL-D 15W/10 Fluorescent Tube Black Light (9280 226 01003)MASTER Actinic BL TL-D 15W/10 1SL/25*** UPC 8727900926965 is for 1 pc From PHILIPS ****** UPC 8727900926972 is for Carton with 25 pcs From PHILIPS ***The Philips MASTER Actinic BL TL-D(-K) family is an ideal choice for insect traps. These lamps have the perfectspectrum for attracting insects. Also, they have virtually no UV-B output, and so are perfectly safe. Furthermore, theyhave the special "MASTER" coating to improve the efficiency