Base Type: 4 Pin Base T5 (4 pins on ONE END) - Length: 14" (357mm) * Compatible UV Replacement Bulb by (Light Spectrum Enterprises, Inc Brand) * Effective Hours Rating: 12,000hrs - Ultraviolet Germicidal Light Bulb * Watts: 16W * Bulb Type: T5 Style Quartz Glass - Light Spectrum Enterprises, Inc Replacement UV Bulb is 100% compatible with Siemens LP4105 water sterilizers and purifiers.