With 28,000 LEDs, It’s Lights! Lights! Lights! Action!

Strung across the Metropolitan Opera’s stage on more than two dozen parallel strands, from the pit to the back wall, 28,000 colorful LEDs will create an ever-changing, sometimes tempestuous sea for the Met’s new production of the Finnish composer Kaija Saariaho’s “L’Amour de Loin,” which opens on Thursday. The lights are the centerpiece of the staging by Robert Lepage, who runs the production company Ex Machina and has directed theater, films, circuses and the Met’s much-debated production of Wagner’s “Ring” cycle.