(1) the rotation of the lamp pole symmetrical shape.The luminaire adopts a rotating-symmetric reflector and installs the symmetry axis of the light source with rotating-symmetric light distribution along the axis of the reflector.The curves of this type of luminaire are concentric (FIG. 1).When this form of street lamp pole is illuminated in single lamp, receive face to get elliptic light spot, illuminance is uneven;However, when the multiple lights are illuminated, the spots are superimposed on each other to produce a satisfactory lighting effect.If stadium is medium, be used commonly hundreds of rotate symmetrical shape lamp lamp pole, install on the tall tower all round stadium, get the illume effect of high illuminance, high even sex.
(2) the two symmetrical plane shape of the lamp pole.The curve of equal intensity of this kind of projection lamp has two symmetric planes.Most lamps and lanterns adopt symmetrical cylindrical reflector, and the linear light source is installed along the axis of the cylinder.
(3) the lamp pole of a symmetrical plane.The curve of equal intensity of luminaire has only one symmetrical plane.The luminaire USES an asymmetric cylindrical reflector or a symmetrical cylindrical reflector with a grid that restricts light.The most typical is the sharp cut-off block retractable shape with light.This kind of light intensity distribution single lamp can obtain a more satisfactory illumination distribution.
(4) the asymmetric shape of the lamp pole.The curve of equal intensity of this kind of lamps and lanterns does not have symmetrical plane.It mainly adopts the mixed light lamps with different kinds of light sources with different distribution of light intensity and special lamps designed according to the specific lighting requirements of the place of use.
