I've bought a lot of solar powered string lights over the last few years including round ones. Even when the solar device is aimed at direct sunlight, they usually don't shine very brightly and dim after a few hours at night. I bought these green balls in December of this year. I live in Sun. Cal but December is our coldest month so there are cloudy days and the sun is not always as bright as the other months but they remain brightly lit until sunrise. I've had them for a week now, we'll see how they hold up, but so far very impressed.
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