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.
Cowboy Wantta Be
© Michelle CampbellEvening Feeding Time
© Michelle CampbellSea & Surfers
© Kerry DragerFlame
© Stefan P. GosattiTired Flower Girl
© Michelle CampbellPre-dawn Christmas Decorations
© Light _