Lights Out Texas launched last spring, led by the Cornell Lab of Ornithology. The program encourages homeowners, building managers and businesses to turn out outdoor lights from March 1 to June 15 from 11 p.m. to 6 a.m. during the spring bird migration in Texas. Turning off interior lights or closing drapes and shutters will also help to reduce light pollution. The peak migration window is between April 19 to May 7.