INDIO, CA – The Coachella Valley Music and Arts Festival, staged here over two weekends April 11-13 and April 18-20, featured headliners Muse, Arcade Fire and more than 180 other acts. In the third year of its double-weekend format, Coachella has not only proven to be a success on the balance sheet — tickets for 2014 sold out within three hours — the festival continues to offer 90,000 daily visitors fresh music along with the element of surprise. It’s also become an early-season proving ground of sorts for a variety of lighting fixtures.