Enlighted Inc., which makes intelligent sensor technology that increases energy efficiency in buildings, has raised $20 million in a Series C round.
New investor RockPort Capital led the round, joined by new investor DFJ JAIC. Existing investors Kleiner Perkins, Draper Fisher Jurvetson and Intel Capital also participated.
Enlighted says its technology is deployed in 10 million square feet of commercial real estate, double that of just five months ago.
LinkedIn, Bank of New York, Google, Turner Broadcasting, JDSU, City of San Jose and Hewlett-Packard are among customers that have reduced energy costs from lighting 50-75%, saving about 15 gigawatt hours since the company launched less than two years ago. 
The payback period is under two years.
Once attached to light fixtures, the Enlighted Sensor monitors light levels, temperature, occupancy and power consumption for 100 square feet around it. Then Enlighted’s Energy Manager analyzes that data, tracking energy consumption, checking conference room availability, visualizing occupancy and other tasks. It adjusts lighting accordingly to optimize energy use, reduce glare or even harvest sunlight.
Employees or building managers can easily personalize spaces for comfort and energy savings with a few mouse clicks. Besides using the technology to control energy, some customers use it to redesign work areas and optimize floor space.
Sensors are viewed as a core ingredient in "living buildings" of the future and and a smart grid.
Energy efficiency is the hottest sector on the 2012 Global Cleantech 100 list, which identifies companies that will likely have a "significant market impact" in 5-10 years.
identify businesses that can make a "significant market impact" in 5-10 years.
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