We bought a few of these for $8.99 and they are awesome. They charge in about 3 hours of sunlight and provide 15 watt of light for 7 hours. .... I also made a short vieo showing a test that I will link below. LightMe Portable 15W 130lm Solar LED Bulb Light, White-1 LightMe https://www.amazon.com/dp/B01CL71HHY/ref=cm_sw_r_tw_awdb_x_kgLvzb8KE0J