Philips TUV 325W HO XPT SE UNP Amalgam Light Bulb (9281 070 05112) TUV 325W HO XPT SE UNP/20*** UPC 8718291548348 is for 1 pc From PHILIPS ****** UPC 8727900804461 is for Carton with 20 pcs From PHILIPS ***Philips TUV Amalgam XPT system consists of an electronic driver that operates one TUV Amalgam XPT lamp,mounted in a sleeve. The electrical specifications are tailored to the lamp, ensuring an optimized performance ofthe Philips TUV Amalgam XPT system. Thanks to extensive testing before a lamp system is released, we can ensure maximum reliability and long lifetime.