Lambert spotlight
A Lambert spotlight is a physically ideal spotlight whose radiance (or luminance) is constant in all directions, i.e. completely diffuse. A Lambertian material appears equally bright regardless of the viewing direction. A black spotlight in particular is a Lambert spotlight. The Lambert radiator is described by Lambert’s law.
Typical Lambert emitters are light-emitting diodes(LEDs) without a plastic lens, the dipole antenna (λ/2 dipole) or approximately a white sheet of paper.
