Re: Lagrange point
Those Lagrange points are more than ten times the distance from a geostationary orbit (roughly 385,000 vs 36,000 KM for L3, L4 and L5, L1 a bit less and L2 a bit more but completely useless behind the moon), so it will supply less than 1% of the light with the same size of the mirror. Besides that, the mirror will see Chengdu only about half the time and half of that while it is in daylight. For some reason I don't really think that would be a good idea.
Biting the hand that feeds IT
