Induction Lights are another good source. They do use mercury unlike the LED ones but with a life of 5-7 that of Metal halide and 50% less energy use they are worth considering.
Re: Energy efficient lighting : CFL vs LED
Induction Lights are another good source. They do use mercury unlike the LED ones but with a life of 5-7 that of Metal halide and 50% less energy use they are worth considering.