silicon solar panels have an efficiency of 20%. NiMH Aa : 600mah/1.2v, this replacement has a bright warm white LED on top. Please turn on the s when charging, the s is at the bottom. Diy absorbs solar energy during the day and turns on automatically at dusk. Solar roof replacement requires at least 8 hours of charging time. It can be bright for 10 hours in summer and 5 hours in winter. A set of 2 replacement solar ceilingsApplication: suitable for all kinds of solar lights. to replace solar modules, used for defective solar modules. These replacement lamps are . Save money because you no longer need to throw away all solar lights. Also includes batteries. Why not buy it now? How to use 1. Slide the off s to on. ( light has a light sensor, it will turn on at dusk) 2. the solar specifications, charge it for more than 8 hours. Solar panel: polysilicon 25% efficiency Aa Ni-MH : 600 mA/1.2 V Led: 1 Leds color: warm white Material: Charging time: 8 hours Working time: 10 hours in summer, and 5 hours after fully charged in winter.