Simply irresistable. Superior light quality from start to finish Energy-efficient alternative to incandescent/halogen.;Improved lumen maintenance over standard metal halide.;Lamp to lamp color consistency over life. MasteColor CDM lamp gives a unique combination of unbeatable light quality and consistent performance over lifetime while keeping running costs low. The Philips MasterColor Tubular Single-Ended T4 lamp is a compact, energy efficient, ceramic metal halide lamp that provides crisp, sparkling light. 90 CRI (color rendering index);High lamp efficacy (up to 104LPW);Vertical position 60 (39W);Universal operating position (70W);Dimensions, base and light center length are same as MasterColor.;Features FadeBlockan integrated UV blocking medium for reduced fading of fabrics and paintings.;39W and 70 Watt versions. Ideal for retail display lighting, and accent lighting.