Camrin Petramale & Neil Adamson
In addition to the planar distribution graph, we have provided the beam angle, field angle and useful information on the spread - including beam and field spread sizes at 1, 3, 5, 7, and 10 meters. While much of this information is easy to calculate on your own, we felt it could be helpful to have the data included in the context of filling a frame of diffusion. The "right light" to get the most illumination from a given diffusion size is often debated. While this is not meant to settle that debate, we do provide a measurement we have named "TRUE Lux" which represents the peak illumination that a source is putting out when its beam angle is wide enough to fill a 1m² area. While "filling" a frame could have multiple interpretations, in this case, we consider the frame filled only when the outer edge is a maximum of one-stop lower than the peak illumination. In other-words, this number is concerned with fill AND evenness across the frame. This number is meant to provide a ratio of beam angle to illumination level, as some luminaries may only have high illumination at such a narrow angle that it has a very specialized usage.
A visualization of different planar distribution graphs overlaid with rough approximations of their beam spread upon a planar surface. These examples are intended for the scale of our graphs only.