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High-efficiency direct reflectors are the commonest type of optical system. In direct reflectors, the light sources are placed in a visible location – right at the top of the reflector. The system can be positioned at any angle (horizontal, vertical or oblique). The structure of a direct reflector depends on how the LEDs are distributed and positioned. A specific part of the reflector is assigned to each LED. If the printed circuit board is tilted, the positions of the LEDs are alternately spaced, the distances between the LEDs are different, or different reflector shapes are used, the individual parts of the reflector are alternately spaced. The LEDs illuminate the rear of the reflector, which then reflects their light towards the light output.