The light guide surface was redesigned by applying micr […]
The light guide surface was redesigned by applying micro-secondary lens array. The illumination uniformity in the space lighting can be effectively enhanced by adjusting the curvature of lens, and the curvature was set less than 1mm. Obviously, the illumination uniformity of the redesigned Flat Panel Led Lighting is better than that of commercial flat panel lights.
The optical system of the flat panel light was designed by free-form curvature lens. The far-field distribution of the free-form lens is a batwing distribution, and can enhance the illumination uniformity on the image plan. By the narrow view angle property of the candela distribution, the average illumination of the free-form lens on the floor is better than that of pillar lens and former flat panel lights. The uniformity of the free-form lens is better than that of former flat panel lights, but is worse than that of pillar lens. The proposed free-form lens can enhance the average illumination on the floor. Therefore, it is suitable for high illumination space design, but is not suitable for soft illumination space design.
The light guide design is an important optical component of LED flat panel light, and it also affects the performance of the illumination uniformity. However, the light guide design of current panel light is still not perfect, in particular, for the view angle and intensity distribution in each angle. The light guide was redesigned by using micro-secondary lens array technique to improve the illumination uniformity. The performance of illumination uniformity on the floor and wall were compared. The enhancement of the illumination uniformity on the floor and the wall are about 61% and 20.5% respectively. If the illumination of on the floor and wall is more uniform, the space lighting in the classroom will become softer.
In conclusion, the light guide surface was redesigned by using secondary lens array technique to improve the illumination uniformity. The candela distribution of the proposed panel light design was adjusted to similar to a batwing distribution, to provide more uniform illumination on the floor. Generally, the enhancements of illumination uniformity on the floor and wall could reach about 61% and 20.5% respectively. The proposed optical design of panel lights really can provide more uniform brightness on the surface of computer monitors and reduce the dark area in the ceiling corner effectively.