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What should I look for when buying good quality solar street lights?

The 3 key points to judge the quality of the solar lights are the brightness(lumens), the lighting time in the night, and the cloudy days and the life span. The main material that determines the life of solar street lights is the lithium battery.

All-In-One Solar street light with Solar panel, LiFePO4 lithium battery, and controller integrated as one unit. The service life of the LiFePO4 lithium battery of up to 2000 deep cycles. The lighting fixture should be extremely bright which ensures over 170lm/watt. Lamp power should be 100% for 12 hours daily i.e. no dimming of the light. Provide at least 2 days of autonomy

solar street lamp