wattstopper lighting energy calculator http://wattstopper.cybermill.com/
The Quick Assessment calculator compares energy savings and paybacks for common lighting control strategies and will help you make informed decisions for "Putting a Stop to Energy Waste™" using products from Watt Stopper/Legrand®.
It only takes a few minutes to see the potential energy savings* for a lighting system retrofit or a new construction project. Start with entering the basic luminaire and lamp data to establish your baseline energy use. Then select from several Lighting Control Measures (LCM's) to determine which lighting controls are best for your lighting project. The additional energy savings from using lighting controls is calculated and simple paybacks and costs are presented.
Look to more functionality in future versions of this handy tool that will include calculations for plug load control savings, day lighting control and time-based controls.