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.Slimline F48T12 CW ALTO - 39 Watt - T12 Linear Fluorescent Tube - Wattage 39 Watt - Base Information: Green Base - Bulb Shape T8 - Bulb Type F48T12 - Single Pin [Single Pin Fluorescent] - Color Temperature: 4100 Kelvin - CRI 62 - Length: 48 Inch. - Life Hours: 9000 - Lumens Initial: 2950 - Lumens Mean: 2600 - Mercury (Hg) Content: 3.5 mg - Case of 15.