Modular lighting has been widely used in daily lighting due to the large demand of high-power lighting. General multiple single by injection to complete a whole bull called module lens, as usual see lamp, downlight usually adopts 3 1, 5 1, 7 1, and flat lens module; lamp, high power lamp with a dozen heads or even dozens of one lens module. The module lens can effectively reduce the production cost, but also ensure the consistency of quality, optimize the lighting mechanism space and so on. The following aspects are analyzed from the following aspects: LED lens optical loss.
Generally speaking, the luminous flux of LED lamps with bubble shell and lens should meet the light distribution required by the standard. Besides, the light transmittance and overflow light loss of the shell, LED lens and other factors should be taken into account. While the light bulb or ordinary lighting needs high power lens, the parallel beam is diffused to meet the design standards. In order to achieve the best optical effect, the lamp housing should be divided into rectangular small units, the purpose of which is to break the wave front of the light, so that the product has a uniform appearance effect. In each small unit, the ellipsoid is used, because the mask has the radian of two directions in horizontal and vertical directions, so that different diffusion effects can be achieved in different directions with different radii of curvature in two directions. The purpose is to overcome the shortcomings of traditional technology and make rational use of luminous flux to achieve uniform and efficient light distribution.
In fact, the shell of bubble type is PC material (injection molding). Spherical, pear shaped, cylindrical bubble shell are non small unit, non planar whole shell, light loss is large, light angle is small. Because one surface of the lens is curved surface with horizontal and vertical curvature radius of two directions, the incident light can be diffused in both horizontal and vertical directions. Since the curvature radii of the two directions are independent of each other, according to the requirements of the product, two curvatures are adjusted respectively, so that the light output can be diffused in different degrees in two directions. Therefore, the lens with bidirectional curvature surface can be used to distribute light output more freely according to the design requirements, and the luminous flux can be more efficiently utilized to reduce unnecessary waste and glare. In addition, due to the smooth transition of the curved surface, the luminaire has a uniform transition of light distribution and a good appearance. Completely transparent PMMA material lights or lampshades will cause glare or dazzling light in the center of the light source, but brightness decreases rapidly around the light source. Many social occasions and work environment lighting must exclude this unpleasant atmosphere or minimize the light source that causes eye discomfort.
The projection of the LED lens unit on the body is rectangular, so that each element can be arranged closely and neatly. The parallel incident beam is refracted by the lens element and forms a symmetrical uniform diffusion in the horizontal direction, and a uniform diffusion of downward deflection is formed in the vertical direction. By adjusting the size of each unit in the lens and the radius of curvature in two directions, the distribution of the luminous flux in different solid angle ranges is formulated, and the light distribution of the design requirement is achieved. In view of the effect of incident surface on the deflection and diffusion of light, the unit number, unit size and radius of curvature of each lens in the product design can be changed according to the actual situation. The actual situation is that the lens on the lens of the high-power lens (for the segmentation of small units) is done by the manufacturer, and only the height, angle and material of the lens are chosen.
The inner side of the light source on the focus of the lens, the light source is far away from the lens, the lens light flux collected less, thus the efficiency of the lens system is low, according to the calculation formula of the convex lens: r = (nL - 1) F. (r convex curvature radius, nL - lens material refractive index, F - lens focal length) in the case of the selected lens material, the greater the focal length, the greater the radius of curvature. Under the condition of the same lens aperture, the thinner the curvature radius is, the thinner the lens is. The thicker the lens, the more obvious the aberration, thus affecting the use effect. Therefore, the lens with larger focal length should be chosen as far as possible. At the same time, with the increase of focal length, the size of optical system increases, so the focal length of lens can not blindly pursue the maximum. Because the lens thickness is not very large, Fresnel lens is not used to avoid the complexity and cost of processing.

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