... saving lamps, spiral-shaped structure, design, attractive appearance, light distribution, the overall design aesthetic standard. Brightness is not ... an average of 7.5 hours per day, available for 18 years, the switching frequency of more than ... using UV-CUT glass, UV-free blue light hazard, no stroboscopic light source is a real health. As long ... , shopping malls, home and other indoor places. light bulb