All lighting fixtures are classified according to the way they distribute their light. If an imaginary horizontal line is drawn on a level with the source of the light, the amount of light directed above and below the line determines the fixture classification.
Hence depending on the way the distribution of light is effected, lighting/ lighting fixtures can be classified as
Direct lighting
Indirect lighting
Semi-Indirect lighting
Semi- direct lighting
Direct lighting: The direct lighting is the one which throws all the light downward on the surface to be illuminated. Direct fixtures distribute 90%-100% of the fixture light output below, with the remaining 0%-10% above.
Indirect lighting: The indirect lighting is the light which directs light on the ceiling and the upper walls from where it is redistributed in well-diffused light throughout the room. Indirect fixtures distribute 90%-100% of the fixture light output above, with the remaining 0%-10% below.
Semi-Indirect lighting: Semi-indirect lighting which may direct approximately 60% of the light toward the ceiling and send 40% downward on a limited area, or vice versa. Semi-Indirect fixtures distribute 60%-90% of the fixture light output above, with the remaining 10%-40% below.
Semi-direct lighting: The semi-direct which distributes 40% over the ceiling and 60% down-ward. Semi- direct fixtures distribute 60%-90% of the fixture light output below, with the remaining 10%-40% above.
The way colors, forms and textures appear to the eye depends upon light, either natural or artificial.
Participants