Panel luminaires must be very uniform so that a reliable evaluation of edges or translucent materials can be carried out in conjunction with industrial image processing.
With conventional matrix systems, in which the LEDs are located directly under the luminous surface, the failure of only one LED means that a correct evaluation can no longer take place, because a grey scale fall-off occurs immediately in the measuring surface. In contrast, with the planistar edge lighting system there is usually no noticeable difference in the uniformity of illumination.