To reduce the high-definition display of light pollution, the best way is to control the light direction of light and light energy distribution. That is, within the effective visual range, all are useful light, the need for light energy as much as possible in the effective visual range. In the field of ineffective visual range, it is harmful light, and it is necessary to minimize the distribution of light energy in the invalid visual range, so as to achieve the goal of reducing light pollution.
LAMP device asymmetric optical design can reduce light pollution. The display is usually mounted at a certain height and mounted horizontally to the level. People usually look up the viewing screen. The lower viewing angle is an effective viewing range. The upper viewing angle is invalid and can cause serious light pollution.
In order to achieve energy saving and reduce the purpose of light pollution, in accordance with the outdoor led display is usually looking up the application environment and viewing habits, proposed LAMP device optical asymmetric vision. By asymmetric optical design of the LAMP device, the partial energy of the upper viewing angle is transferred to the visible range of the lower viewing angle so as to increase the brightness within the effective viewing range of the lower viewing angle while reducing the light angle in the visible range the goal of.
Reduce the light pollution within the visible range of the lower viewing angle. The brightness in the effective viewing range of the lower viewing angle is the effective brightness, and the asymmetry of the LAMP is better than the normal LAMP. In the lower viewing angle is not visible within the visible brightness is harmful brightness, asymmetric LAMP brightness to the smaller the better, can reduce the invalid visual range of light pollution.
When the horizontal 0 ° angle of view brightness value is the same, in the lower viewing angle is invalid visual range, when the horizontal viewing angle is greater than ± 60 °, the asymmetric AB series LAMP device box brightness decline speed, much higher than the normal LAMP device box decline Speed, so the brightness of the asymmetric LAMP box is lower than that of the normal LAMP box, that is, the light pollution of the asymmetric LAMP device is lower than that of the normal LAMP device.
Reduce the light pollution within the visible range of the upper viewing angle. In order to compare the asymmetric LAMP device with the normal LAMP device and the normal LAMP device in the upper viewing angle within the visual range of light pollution, the asymmetric LAMP device box and the normal LAMP device box power adjustment is the same, the upper viewing angle range of different viewing angle brightness comparing. In the upper viewing angle range, from the asymmetric LAMP box brightness and normal LAMP box brightness contrast, the use of asymmetric optical design LAMP device, at different angles, can reduce light pollution 10% to 50%.