The ALTO technology that highlights this Philips 15-Watt T8 Linear Fluorescent Light Bulb (F15T8/COOL WHITE PLUS) minimizes mercury content for enhanced environmental friendliness. The bulb emanates 1,175-Lumens of cool white light with a 4100K color temperature for bright illumination and provides up to 7,500-hours of long-lasting use. Energy efficient while providing plenty of light for multiple indoor applications.