done it for years, long before blaserlite was thought of, never had a problem until i gave it to a mate and he walked round all night with the full beam on, a hole melted in the reflector!! and keep the vents open at the back as well...
i have blaser, laser and the 170.... the 170 is better for big fields by far but i never leave home without the blaserlite, the hinged filter and secondary bulb for gates etc is priceless!!