OK, but efficiency at converting light into electricity doesn't mean much if the total amount of light available for conversion is very low -- which it is in al

OK, but efficiency at converting light into electricity doesn't mean much if the total amount of light available for conversion is very low -- which it is in almost all indoor situations. The illumination level in a brightly-lit office is typically on the order of 300 lux, compared to 100,000 lux for direct sunlight. (Residential spaces are often even dimmer.) So if, as they claim, this device can gain 1 hour of charge in 20 minutes in direct sunlight, it would take on the order of 100 hours to collect the same amount of energy indoors. The statement that "the panels can also create some power from artificial light" is technically true, but "some" is doing a lot of heavy lifting in that sentence.