How to see the light distribution curve graphic interpretation

the definition of light distribution curve of light distribution curve is in fact a lamps and lanterns or light sources emit light distribution in the space. It can record the luminous flux of lamps and lanterns, light quantity, power, power factor, the size of the lamps and lanterns, lamps and lanterns efficiency including manufacturer of lamps and lanterns, type and other information. , of course, the most critical or recorded the light intensity of lamps and lanterns in all directions.

light distribution curve of the classification according to the symmetry properties of light distribution curve is usually divided into axial symmetry, symmetric and asymmetric light distribution.

the axial symmetry is also known as rotational symmetry, refers to all directions of light distribution curve are basic symmetry, general tube lamp, mining lamp are such light distribution.

to say when the lamps and lanterns C0 ° and C180 ° profile light distribution is symmetrical, and at the same time C90 ° and C270 ° profile light distribution is symmetrical, the light distribution curve is called asymmetric light distribution is, not to say C0 ° -

180 ° and C90 ° - Section 270 ° any asymmetrical light distribution.

light distribution curve according to the beam Angle is usually divided into narrow light distribution (

in the distribution of light ( 20°> 40°)

(wide light distribution > 40°)

there is no strict definition of each manufacturer, narrow definition in width, is also slightly different.

says the definition and classification of half a day. Below we see something really - — Bracket light distribution curve of

T = C0 ° - 180°

=人私下偷偷收藏盒式°- 270 °

the first picture here is our most common polar light distribution curve, if you want to read it first to know T and this article 2 curves, respectively, from which A. In the graphic below are comments T = C0 ° - 180°A = C90°- 270 ° the C represents the horizontal plane Angle ( Solid Angle from horizontal Angle and vertical Angle of two Angle) 。 0°- 180 ° formed a section, T is for the distribution of light in this section. C0 ° - in the bracket 180 ° is generally defined as the vertical and the direction of the tube. Similarly A is said light in C90 ° - The distribution of 270 ° profiles. Below

to know T and A curve of two section, we continue to look at how each of these curves.

polar diagram of origin ( Concentric circle) The surface center for light of lamps and lanterns;

each concentric said a light intensity value, the lower outer ring light intensity is larger;

every Angle value in this picture is the profile of the vertical Angle, downward direction is defined as 0 ° below

note in a CD / 1000 lm unit, this means that it is a on the basis of thousand lumens of light distribution, conversion is needed to get the actual light intensity ( How to convert needless to say, 1000 lm is 50 CD, 2000 lm is 100 CD cough up! ) 。 It is for the convenience of comparison between different lamps and lanterns light distribution.

good, under the polar light distribution curve of the picture is actually graph, such as illuminance is connect the intensity of illumination of the same point with curve, believe that this figure is easy to understand, note that there are same lumens illuminance diagram, etc. We can correspond to look at the up and down, to find the feeling of light distribution curve.

ok to continue, today we look at a light distribution curve, this way of said general multi-purpose in cast light lamps and lanterns. Also give you two picture, which one is after illumination, such as graph.

look at the graph and the front is not the same, actually under careful observation can find they are just different way said, basic elements are the same. First of all is a solid line is two curves C0 ° - 180 °, the dotted line is the C90 ° - 270°。 Horizontal Angle value profile on the vertical Angle, 0 degrees for lamps and lanterns is shiny surface center. Longitudinal numerical said light intensity. Also pay attention to the upper left corner CD / 1000 lm.

from the dotted line is C90 ° - 270 ° the line as you can see the lamps and lanterns of asymmetrical light distribution. How to see? Symmetric asymmetric mainly only Angle. The Angle of the light distribution curve is usually defined by the beam Angle for the peak of lamps and lanterns ( Maximum) Half light intensity of the light intensity values the included Angle. Peak value of the above graphs, dotted line is probably around 1100 CD, half peak is about 550 CD, Angle should be more than 10 degrees on the left, the right should be less than 10 degrees, which can judge the lamp for asymmetric light distribution. Here when it comes to the definition of the Angle of the method is the standard used ( Is the current domestic commonly used) , is slightly different. It is defined as the peak ( Maximum) 1/10 light intensity of the light intensity value of the included Angle of beam Angle of lamps and lanterns.

intensity of illumination, such as graph also not much said, very simple, pay attention to black spots in this picture is good, that is the position of lamps and lanterns. From this table can also validate the symmetric property of light just after the multidirectional forward less obviously.

Sophy

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