Dimensions and weight Size: 99 x 99 x 60mm Weight: 650g Physical properties Compressive strength: 69,872 N Water-resistant: IP68 Operating temperature: -40 to +70 degrees Celsius Operating time: more than 20 hours Onset point: 150 to 350lux Charging time: 3 (sunny) to 8 (cloudy and rainy) Color: amber Luminance (Nit): 2.4/2.0 Illuminance (Lux): 7.5/6.3 Uniformity: 83% Luminance(cd/m) measurement: The luminance of 9 points on the lighting area are measured and averaged. Illuminance(lm/m) is obtained by multiplying 3.14 to luminance. Uniformity is obtained by dividing minimum luminance by maximum luminance from 9 point measurements. Basic components: Single crystalline solar cell Solar maximum output power: 1.788W Solar operating current: 600mA Solar voltage: 2.98V LED LED size: 3.5 x 2.8mm chip type LED current: 20mA per each LED operating current: R,Y,O (1.8mA per each) B,W,G (1.1mA per each) LED voltage: R,Y,O(2.5V) B,W,G(4.0V) LED wattage: 0.004W LED quantities: 4 pieces Pseudo capacitor: Pseudo capacitor: 2.3V 120F Number of Pseudo capacitor: 2 pcs