Any light in the direction of the luminous intensity of the space are not the same, we can use data or graphics to illuminate the luminous intensity of the distribution of space in the space recorded, usually we use the ordinate to represent the light intensity distribution of light, As the center, the luminous intensity of each direction with a vector marked out, connecting the end of the vector, that is, the formation of light intensity distribution curve, also known as light distribution curve.
Because most of the shape of the lamp is an axisymmetric rotating body, its luminescence intensity in the spatial distribution is also axisymmetric. So, through the lamp axis to take any plane to the plane of the light intensity distribution curve to indicate the distribution of lighting fixtures in the entire space is enough. If the luminous intensity of the lighting fixture in the space is asymmetric, such as long fluorescent lamps, you need to use a number of light-measuring plane of the light intensity distribution curve to illustrate the spatial light distribution. The plane of the vertical line passing through the center of the lamp is the C0 plane, the plane perpendicular to the C0 plane and the vertical line passing through the center of the lamp is the C90 plane. At least the use of C0, C90 two plane light intensity distribution of asymmetric lamps with the light distribution. In order to facilitate the comparison of the light distribution characteristics of various lighting fixtures, the light intensity distribution data is provided by a hypothetical light source with a luminous flux of 1000 lumens (lm). Therefore, the actual light intensity should be metering data provided by the light intensity multiplied by the actual light flux of light and 1000 ratio.
The light intensity distribution of the lighting fixture is realized by using the reflector of the lamp, the light-transmitting prism, the grille or the diffuser. The reflector is the basic light control part of the lamp, the higher the reflectance, the stronger the regular reflection, the more obvious the control light ability. Anodizing or polishing alumina, stainless steel plate is a commonly used mirror emission material. In accordance with the rules of the law of reflection on the aluminum reflector geometry, size, careful design, installation attention to the precise positioning of the light source, you can get a variety of needs light distribution. Grille mainly from the shelter light source, reducing the role of direct glare. The light distribution through the grille is generally narrow.