What should I do if the light is not turning on?
If the light is not turning on, it is likely due to insufficient sunlight, so place it in a sunnier location. Ensure the solar panel has received at least 6-8 hours of direct sunlight, try charging via USB, and check that the power switch is in the ON position. (Pages 5, 7, 9)
From the official Brightown HLS-W-XXXWW-S LED Solar Firefly Light manual, page 7
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