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/D ALTO 24PK. Base: Medium Bi-Pin [Medium Bi-Pin Fluorescent] - Base Information: Green [Green Base] - Bulb: T8 [26 mm] - Color Code: 54-765 - Color Designation: Cool Daylight - Luminance Average EM: 0.85 cd/cm2 - Mercury (Hg) Content: 2.0 mg - Color Rendering Index: 75 Ra8