Range of double-ended, compact, high-efficiency, discharge lamps with a stable colour over lifetime and a crisp, sparkling light. 150W 4200K Cool White lamp with 16000 hour average lamp life Length 137.43mm / Diameter 25mm Warm or cool white colour impression High lamp efficacy results in low operating costs and low heat generation. Provides better operating costs and improved light quality versus standard quartz metal halide (MHN/W-TD) Shops and shop windows, offices and public buildings Must be used in combination with a ballast and ignitor or electronic gear