ft-l

A former luminance unit equal to one lumen per square foot.

• 🇩🇪Veraltete Einheit der Leuchtdichte, die einem Lumen pro Quadratfuß entspricht.

1. Luminance unit C2 formal scientific

   A former unit of luminance equal to one lumen per square foot, used to measure the brightness of a surface.

   • The display's brightness was measured at 50 ft-L.
   • Older projectors often specified their output in foot-lamberts.
   • The calibration standard required a luminance of 30 ft-L.

   🇩🇪Foot-Lambert

   Synonyme: foot-lambert