A bypass circuit is provided for each LED in a series to permit continued operation with reduced lighting in the event of an LED failure.
Functional imaging is thus achieved for both bright and dim lighting, and over a wide range of viewing distances.
Thus, the device may be used in place of a flash attachment (72) for still photography under low-light conditions.
The aim of the invention is to improve image quality, especially the brightness and definition of the images while requiring little lighting equipment.
The case (10) of the device may have phosphorescent doping so as to provide a dim illumination even when the device is not energized.
Additionally, dimmer devices with integrated sensors may be included to dim the lighting devices (10).
Further, optics may be provided to detect light reflected from the screen and direct more light to portions of the screen having reduced illumination.