Analyze the light loss of the LED lens

LED lens module

The multi-head lens is formed by injection molding a plurality of single lenses, and can be designed into a 3, 1, 5, or even dozens of lens modules according to different requirements; this design effectively saves production cost and achieves product quality. Consistency, saving space in the luminaire, and making it easier to achieve "high power".

Light loss

1. The luminous flux of a luminaire with a bulb or a lens actually meets the light distribution required by the standard, and factors such as the transmittance of the outer casing, the lens, and the loss of light are also considered. The high power of the lamp or the general illumination requires the lens to diffuse the parallel beam to meet the standard requirements. In order to make the optical effect more reasonable, the lamp cover should be divided into rectangular small units in the design. The purpose of this is to break the wave surface of the light wave, so that the product has a uniform appearance. In each small unit, an ellipsoid is used because the surface has curvatures in both the horizontal and vertical directions, so that different diffusion radii can be achieved with different radii of curvature in both directions. Its fundamental purpose is to overcome the deficiencies of traditional technologies and make rational use of luminous flux to achieve uniform and efficient light distribution.

In fact, the outer shell of the bulb is PC material (injection finished), and the spherical, pear-shaped and cylindrical bulbs are non-small units and non-planar whole shells, and the light loss is large and the light angle is small. 2. Since one surface of the lens is a curved surface having a radius of curvature in both the horizontal and vertical directions, incident light can be diffused both in the horizontal direction and in the vertical direction. Since the radii of curvature in the two directions are independent of each other, the two curvatures can be separately adjusted as required, so that the light output is diffused to different extents in both directions. Therefore, using a lens composed of a bidirectional curvature surface, the light output can be more freely distributed according to design requirements, and the luminous flux can be utilized more efficiently, thereby reducing unnecessary waste and glare. Furthermore, since a smooth transition surface is used, the lamp has a uniform transition light distribution and a good appearance. A completely transparent PMMA lighting or lampshade can cause dazzling or glaring chords in the center of the light source, but the brightness is rapidly reduced at the periphery of the light source. Many social occasions and work environment lighting must eliminate this unpleasant atmosphere or minimize the source of eye discomfort.

3. The projection of each lens unit on the body is rectangular, so that the units can be arranged closely and neatly. The parallel incident beam passes through the refraction of the lens unit to form a uniform diffusion in the horizontal direction and a uniform diffusion in the vertical direction. By adjusting the size of each unit in a group of lenses and the radius of curvature of the two directions, the distribution of the emitted light flux in different solid angle ranges is adjusted to achieve the light distribution required by the design.

Since the effect of the incident curved surface is to deflect the light to form a diffusion, the number of cells, the size of the unit, and the radius of curvature of each lens in the product design can be changed according to the actual situation. The actual situation is that the internal grain on the lens of the high-power lens (for dividing the small unit) is made by the manufacturer, and only the lens height, angle, and material are considered when selecting.

4. We choose to place the light source on the inner side of the lens focus. The farther the light source is from the lens, the less the light flux of the light source collected by the lens, the lower the efficiency of the lens system. According to the calculation formula of single convex lens: r=(nL-1)f. Where r—convex curvature radius, nL—lens material refractive index, f—lens focal length
In the case of a selected lens material, the larger the focal length, the larger the radius of curvature. Under the same lens aperture Φ, the larger the radius of curvature, the thinner the lens. The thicker the lens, the more obvious the aberration will be, which will affect the effect. Therefore, choose a lens with a larger focal length as much as possible. At the same time, the focal length increases and the size of the optical system increases. Therefore, the focal length of the lens cannot be pursued to the maximum. Since the lens thickness is not very large, the Fresnel lens is not used, and the cumbersomeness and cost of processing are avoided.

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