Here’s a photo of a building’s night lighting after some retrofitting with LEDS. The Fire and Emergency Services building for the US Army's Camp Humphreys (Pyeongtaek, Korea) replaced some of its external lights with four LEDtronics WWL20 Wall-Paks that use 56 Watts each. These are the white lights you see on the right side, at the entrance to the truck bays. The rest of the building is lit by 250-Watt HPS (high-pressure sodium) Wall-Packs.
The LED light costs about $700 in single quantities, while an equivalent HPS light costs about $225. True, the energy savings will offset some of the (much) higher price of the LED version, but the real value of the LED light is in its truer color, giving better nighttime visibility around the fire station, and its ruggedness and longer lifetime.
This goes back to what Paul Scheidt, Product Manager, Cree Components, said at the LED Workshop panel last April: The key application for LED lighting is not a replacement for the 60W light bulb. It’s in applications that make use of an LED’s unique features such as ruggedness, increased lifetime, color control, and dimmability.