Light (both natural and otherwise) is an essential tool in photography - here's a gallery dedicated to light use in photos, including low-light photography, black and white available light photos, night and morning photos.
Doe In The Woods
© Michelle CampbellRing Me Up
© Patricia MarroquinMetropolitan SLC, UT
© Trae C. Pattonmorning thaw
© Donna R. MoratelliWinter White
© Kerry DragerPorch Columns - Athens, Georgia
© Tim Fields