Lamps and lanterns of photometric coordinate system

One, such as sphere of light intensity curve

1, the light source is put in the center of the sphere

2, the size of the light source compared with the radius of the sphere can satisfy the conditions of the point source

3, can be used to indicate the direction of the coordinates of the sphere of light

4 equal points connected, spherical surface glazing, quick as the light intensity curve of

2, space coordinates system in order to express the photometric characteristics of lamps and lanterns, established the spatial coordinate system

the space coordinate system is divided into two categories

photometric reference axis of lamps and lanterns down A minus α,B - β,C - Lamps and lanterns of gamma

photometric reference axis X - level Y V - H

- α,B - β,C - Gamma system

A minus α,B - β,C -

the characteristics of gamma coordinate systems are suitable for all kinds of indoor lighting lamps and lanterns and road lighting lamps and lanterns of lamps and lanterns of

the optical axis of vertical down

A, B, C, the change of longitude latitude

alpha, beta, gamma said change

3, A minus α,B - β,C - Gamma system conversion between

4, space coordinate system - — X - Y V - H system

- X Y V - The characteristics of H coordinate system

1, is used to cast light lamps, signal lamps, part of the movie stage

2, lamps and lanterns of lamps and lanterns optical axis horizontal

3, X, V: the change of longitude, Y, H said the change of latitude

Sophy

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