Initial Lumens:80000 Color Temp.:5200 CRI:85 Glass Size: TT64 -Metal halide lamp, MH lamp, MH bulb 400W -Metal halide lamp, MH lamp, MH bulb 400W / 600W / 1000W / 1500W -Metal halide lamps are among the most energy efficient sources of white light available today. These lamps feature special chemical compounds known as halides that produce light in most regions of the spectrum. They offer high efficiency, excellent color rendition, long service life and good lumen maintenance. Because of their numerous advantages, metal halide lamps are used extensively in outdoor applications and in commercial interiors.