A light device, preferably a metal halide high pressure discharge lamp, which includes a first body which has a light element, a second body which encompasses the first body, whereby the second body consists essentially of an Al-silicate glass, for example a hard glass. The Al-silica glass has a Tg of >600° C., preferred >650° C., especially preferred >700° C., particularly preferred >750° C., and a thermal expansion coefficient α20/300>0, preferably in the range of 3≦α20/300≦6, particularly preferred 3.5≦α20/300≦5.5