... , tempered glass Protection grade: IP60 Life expectancy: 5 years Effective light: 150 / P1m / w, respectively, could be saving 90%, 75 ... 3. Bryant High efficacy electrodeless lamp, more energy than other light sources. Characteristics: Long-life: average life expectancy of 100, ... , etc., in particular, apply to, such as a tunnel, subway, cold storage, billboards, such as lamps to maintain a place ...