Light-emitting diodes, or LEDs, are reinventing the look and feel of skylines, bridges, facades and other architectural surfaces around the globe. The light bulb is being unscrewed by energy-efficient LEDs that are both environmentally friendly and cost-effective. The $10.2 billion industry is growing to provide new design options for architects and planners. [source]
Light plays an important role not just in photography or historic preservation but also in regular design. Of course, playing with sunlight is a better course of action but when the sun goes down, technology takes over. And to an admirable effect too.