Participants bought bulbs measuring 8.5 centimeters in diameter, each containing an LED charged with solar power, and threw them into the river. The bulbs were collected by the organizers using a net downstream.
Photo taken from a Kyodo News helicopter shows the Sumida River in Tokyo's Taito Ward with its surface lit up in blue by 100,000 bulbs containing light-emitting diodes, mimicking fireflies, during an event called ''Tokyo Firefly'' on May 6, 2012.
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