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Come to Tokyo Hackerspace and learn how to solder or put togther your very own Mason jar solar lantern. These lanterns are perfect for rolling blackouts since they require no maintenance other than being left in a sunny area. The battery life is from 6-8 hours on a day's charge and provides nice, romantic mood lighting for this summer's blackout season.
The cost is free for members and 1000 yen for non-members to attend. The kits will be sold at the space for 1200 yen each and include all the parts for a solar lantern including jar and battery. Come make one or many and take them home. No soldering or electronics experience required.