A new energy-efficient lighting system will illuminate the National Mall beginning Monday night.

Though controversy over the federal incandescent bulb ban continues, Department of the Interior Secretary Ken Salazar will flip the switch for a new LED light-system at 5:30 p.m.

Recommended Stories

U.S. to join world in push for LED lights

A Nation of Dim Bulbs

A look at winners of 2014 Nobel Prize in physics