UL, CUL, DLC certificate. E39 lamp base. 360 degree lighting, high CRI. Can be with Longer or short Plastic Housing. Big heat sink, double SUNON fans. Internal driver, input voltage AC100-277V. New style and high efficient wide-range input. Long lifespan and good heat dissipation. Direct replacement for Metal Halide, Easy Installation. Fits many different fixtures to replace traditional lamps.