Aluminum reflector, the inside reflecting surface has a very shiny coating, with Pulso bayonet mount. The reflector is shaped into a perfect parabola, focused at the protecting glass of the lamp base. A phenomenal light power is achieved, which is compared to structured standard reflectors is 1.3 f-stops superior. For a more even light distribution its recommend to use the matt protecting glass. While it does introduce a slight 0,7 f-stop reduction in power; illumination is nevertheless uniformly concentric with a marked centre highlight.