Optical control of lighting

Optical control of lighting

led high bay lights


If a bare lamp is used in a fixture, the distribution of light may not be acceptable and the system will certainly not be economical. In this type of situation, the bare lamp is likely to be a source of glare for the occupants of the room and, even if some of the light reaches the worktop, the efficiency of the installation can be seriously affected. Reduced because of the phenomenon of glare.

It is obvious that a light control system is necessary; the most frequently used methods are described below.

The opaque screens


If a lamp is installed in an opaque enclosure with a single opening to allow light to pass through, the distribution of light will be limited.


The reflection


This light control method uses reflective surfaces that can vary from a very matte appearance to a highly specular or mirror-like appearance. It is more efficient than opaque screens because scattered light is recovered and redirected where it is needed.


Diffusion


If a lamp is installed in a translucent material, the apparent size of the light source increases, while its brightness decreases. Existing diffusers, unfortunately, absorb some of the light emitted, which has the effect of reducing the overall efficiency of the luminaire.

 Refraction



This method utilizes the effect of "prism", wherein a prism of glass or plastic changes the direction of the light rays and so redirects the light toward the area where it is needed. This method is very well suited to general indoor lighting. It has the advantage of combining good glare control with acceptable efficiency.

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