Philips leads the industry with the lowest level mercury technology. Reducing the mercury level (source reduction) during the manufacturing phase is essential to creating products that are less harmful to the environment. F15T8 CW ALTO. Base: Medium Bi-Pin [Medium Bi-Pin Fluorescent] - Base Information: Green [Green Base]- Bulb: T8 [26 mm] - Life to 10% failures EM: 10000 hr - Avg. Life: 13000 hr - Color Code: 33-640 - Color Designation: Cool White - Color Temperature: 4100 K- Initial Lumens: 830 Lm - Watts: 15 W - Lamp Wattage: 15.5 W - Lamp Voltage: 55 V - Lamp Current EM: 0.335 A - Mercury (Hg) Content: 2.0 mg