The Latro (which comes to us by way of Treehugger) requires sun, which can be provided by leaving the device (which really looks more like a huge beaker full of green goo than an actual lamp) outside during the day–or presumably, in a sunny window. While the algae is photosynthesizing away, it will also be charging up a battery, which then releases light, according to the designer “within the hours of darkness” (we assume automatically).
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"We're the future - YOUR future." | Psychopomp - 0 views
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Catch Us If You Can Teacher's Booklet (pdf) - 0 views
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