Government mandates aren't the only motivation for more energy-conscious means of lighting and climate controls. Simon Properties is responding to two green sources of inspiration- the environment, and cash. From an Indy Star article:
Simon's energy use has fallen by 9.7 percent from 2003 to 2006, a reduction of 102 million kilowatt hours of electricity. That equals nearly 68,000 metric tons of carbon emission that weren't dispersed into the atmosphere and an $11 million annual savings in operating costs.
Simon's investment was $20 million. The investment paid for itself in just two years.
It's good to see articles like this. They can inspire other businesses to follow suit, way ahead of the speed of government mandates because most businesses have operations that are dwarfed by Simon. You can easily enough say, "If they could do it, I can do it".