Philips ALTO lamps feature award-winning, energy efficient ALTO technology in a trusted format. This Philips ALTO 26876-3 CFL bulb operates at 42 watts and has a color temperature of 4000K. The lamp has an initial lumen output of 3,200 lumens and an average life of 16,000 hours. With its GX24q-4 base, this compact fluorescent lamp produces a bright white light and is perfect for industrial lighting, commercial lighting, and business lighting. This lamp should be used to replace Philips brand lamps ONLY and may not fit into all generic 42-watt fixtures.