I first wrote about the development of LED Fresnel lights two years ago, tracking earlier reactions by the industry to high energy consumption and high heat output: “Greening the Film Business: LED Fresnels.” This year I followed up with some of the same manufacturers.

Fresnel lenses, originally invented for lighthouses, have long been used on movie lights for careful light control and sharp shadows. Their typical concentric ring style enables them to have great diameter without clumsy thickness.