Up in NY we get some short days in Winter and a low Winter sun. I maximize my sunlight by installing cheap "back-of-the-door" mirrors behind the benches on the north walls.
http://imageshack.us/a/img832/1691/271ga.jpg
http://imageshack.us/a/img87/1220/219wg.jpg
13"x49" mirrors are available at home depot for $5.97
http://www.homedepot.com/h_d1/N-25ec...1#.UL4ahoYgs_8
Model # 72923
Store
SKU # 279348
Store SO SKU # 279348
Hotwired NY 5b
http://www.hotwiredgardens.com/pdf/G...d_starting.pdf