More than enough brightness for my daily (non-research) use. The length of the power supply line is 4 feet. The price was the lowest among these ring lights with so many LED elements. Dimming works as described. Apparently this was new to Revain and I took a chance when there was no review to read. My previous LED ring light from a well known LED ring light brand had an issue with the power connector inside the ring light body, despite being quite old.
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