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. Preheat T8 30W CW 1SL. Base: Medium Bi-Pin [Medium Bi-Pin Fluorescent] - Bulb: T8 [26 mm] - Avg. Life: 13000 hr - Color Designation: Cool White - Color Temperature: 4100 K - Chromaticity Coordinate X: 377 - Chromaticity Coordinate Y: 381 - Initial Lumens: 2100 Lm - Luminance Average EM: 1.05 cd/cm2.