His name is Albert Paul Zeller, and he is the fourth-generation managing director of RC Tritec, a Teufen-based company ...
which is complicated to translate into the real world, because you need luminous intensity (brightness) and apex angle (how the light spreads), and then a bunch of calculus (Φv = 2πIv (1−cos α/2), if ...
The Same, but Different Many LED Fresnels are more like soft-edge wash lights than their namesake; their barn doors are more ...