What are the classification of light distribution curves of lamps? How to look at the light distribution curve?

What is the light distribution curve of lamps, what is the light distribution curve of lamps, and what is its use? With these questions, please read this article in Xiaobian carefully, and you will find the answer you want in the article. Precisely by definition. The light distribution curve refers to the strong light distribution direction of light sources or lamps in each space, which can record some important information such as luminous flux, number of light sources, power, power factor, lamp size and so on.

Representation method of light distribution curve:

Generally, there are three representations of light distribution curve: one is polar coordinate method, the other is rectangular coordinate method, and the third is equal light intensity curve.

A, polar light distribution curve:

on the photometric plane passing through the center of the light source, measure the light intensity values of lamps at different angles. From a certain direction, with the angle as a function, the light intensity of each angle is marked with a vector, and the connection at the top of the connection vector is the polar light distribution curve of the lighting fixture. If the lamp has a rotational symmetry axis, the spatial distribution of its light intensity can be explained only by the light intensity distribution curve on a light measuring plane passing through the axis. < P > If the light distribution of the lamp in space is asymmetric, the spatial distribution of its light intensity can be explained only by the light intensity distribution curves of several light measuring planes.

B, rectangular coordinate light distribution curve:

For spotlight lamps, it is difficult to express the spatial distribution of their light intensity by polar coordinates, so the right-angle light distribution curve is used, the vertical axis represents the light intensity diagram I, and the horizontal axis represents the projection angle of the light beam. For lamps with symmetrical rotation axis, only one light distribution curve is needed, and for asymmetric lamps, multiple light distribution curves are needed.

C, light intensity curve:

The curve connecting the top of vectors with equal light intensity is called isointensity curve, and the values of adjacent isointensity curves are arranged in a certain proportion, and a series of isointensity curves are drawn, which are called isointensity diagram. Commonly used diagrams include circular network diagram, rectangular network diagram and positive arc network diagram. Because the rectangular network diagram can not only explain the light intensity distribution of lamps, but also explain the regional distribution of light quantity, so the constant light intensity curves used by projection lamps at present are all rectangular network diagrams, which we will not introduce here.

How to look at the light distribution curve

The luminous intensity of any lamp is different in all directions in space. We can record the distribution of the luminous intensity of lighting lamps in space with data or graphics. Usually, we use the ordinate to represent the light intensity distribution of lighting lamps, mark the luminous intensity in all directions with the coordinate origin as the center, and connect the endpoints of the vector to form a light intensity distribution curve, which is also called a light distribution curve.

Because most lamps are axisymmetrical rotating bodies, their luminous intensity distribution in space is also axisymmetrical. Therefore, it is enough to show the distribution of lighting lamps in the whole space by taking any plane as the axis of lamps and lanterns and using the light intensity distribution curve in this plane. If the spatial distribution of luminous intensity of lighting fixtures is asymmetric, such as strip fluorescent fixtures, it is necessary to use the light intensity distribution curves of several metering planes to explain the spatial light distribution. Take the plane perpendicular to the long axis of the lamp and passing through the sag line of the lamp center as C plane, and the plane perpendicular to C plane and passing through the sag line of the lamp center as C9 plane. At least the light intensity distribution of C and C9 planes should be used to explain the spatial light distribution of asymmetric lamps.

in order to compare the light distribution characteristics of various lighting fixtures, it is uniformly stipulated that an imaginary light source with luminous flux of 1 lumens (lm) is used to provide light intensity distribution data. Therefore, the actual light intensity should be the light intensity provided by the photometric data multiplied by the ratio of the actual luminous flux of the light source to 1.

the light intensity distribution of lighting lamps is realized by controlling the lighting with reflector, transparent prism, grille or diffuser. The reflector is the basic light control component of the lamp. The higher the reflection ratio, the stronger the regular reflection and the more remarkable the light control ability. Anodized or polished aluminum oxide and stainless steel plates are commonly used as specular emission materials. According to the regular reflection law, the geometric shape and size of aluminum reflector are carefully designed, and the light source is accurately positioned during installation, so that all kinds of required light distribution can be obtained. Grille is mainly used to shield the light source and reduce the direct glare. The light distribution through the grating is generally narrow.

The above is the knowledge about light distribution curve of lamps introduced by Xiaobian. I hope you can read it carefully, learn more knowledge from it and get some application in your life. Simply speaking, the light distribution curve of lamps is the distribution of light emitted by lamps or light sources in space, which is mainly used in some lamp manufacturers or studios. Usually, we rarely involve this knowledge, but it is not a bad thing to know more about it, and it is always useful.