Wu, M.S.; Huang, H.H.; Huang, B.J.; Tang, C.W.; Cheng, C.W. - In: Renewable Energy 34 (2009) 8, pp. 1934-1938
The optical efficacy of light emitting diode (LED) has exceeded 72lm/W in 2006. This implies that energy can be saved about 75%, as compared to mercury lamps widely used in roadway lighting. In some remote areas where the grid power cannot reach, independent solar-powered lighting using...
