(1), optical characteristics, such as light distribution, glare control;
(2), economy, such as luminaire efficiency, initial investment and long-term operating costs;
(3), special environmental conditions, such as fire hazard, explosion risk environment, dust, moisture, vibration and chemical corrosion of the environment;
(4), luminaire shape should be in harmony with the building;
(5), luminaire efficiency (AA) High: Η=φl/φo, depending on the shape and material of the reflector, the size of the light mouth, diffuse hood or grille shape and material;
(6), the IP level that meets the environmental conditions.
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