The solar cells used in the Stella lux are available today, and have been available for at least a year. I have a 100w flexible panel sitting about ten feet from me now. Search "100w flexible sun power solar panel". Those cells are 21.5% efficient. The price of the panel sitting here was $140 on amazon.com, and weight is 4lbs.
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Wow, thanks. I'd be very interested if I hadn't already bought a 102 watt folding rigid solar array. I'll have to think of some project I need a flexible solar panel for.