TCP’s halogen lamps produce the same light output and color rendering characteristics as incandescent lamps and use 50 percent less energy. Precision infra-red light and multiple microscopic layers of infra-red (IR) reflective coating are applied to the glass for optimal IR reflection. The elliptical-shaped precision quartz body allows more IR energy to reflect back to the filament, creating maximum lumen output. Also, the filament is perfectly centered, increasing energy efficiency and lumen output. TCP's halogens are designed to last up to 25,000 hours. If you want even longer lasting lamps, see our LED MR16s for superior lumen output.