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These satellites would reflect light at night, and
. . . 8 times brighter than the light from a full moon,
. . . enough to brighten the streets of Chengdu,
. . . without spending any electricity on lighting.

Such a plan, if it works, could save the city nearly
. . . $250 million in electricity costs per year,
. . . more than enough to justify the cost of the satellites.

10/29/2018 Source:  China street lights, replaced by 3 reflective space #satellites