Optical Loss of LED Lens

What is LED lens module?

It is the number of single lens by injection to complete a whole long lens, can be designed according to different needs 3-in-1 or even dozens of pieces of 1,5-one lens module. This design effectively saving production costs, product quality consistency, space saving, and easier to achieve "high-power" and so on.

1.      The LED lamp which have blister and lens, the luminous flux need to meet the actual requirements of the standard light distribution. Also need to consider the transmittance of the lens, the light loss factors such as overflow. The bulbs for general lighting lamps or high-power lens will need to use a parallel beam diffusion process to meet the standard requirements. The optical effect is more reasonable, the design should be divided into small rectangular lighting unit cover, this aim is to break the light wavefront, to create a uniform appearance of products. In each small element, use the ellipsoid, since the surface has horizontal and vertical directions of curvature, which can be in two directions with different radii of curvature to achieve different diffusion effect. Its fundamental purpose is to overcome the shortcomings of traditional technologies, rational use of flux, to achieve uniform and efficient light distribution. In fact Bulb housing is make of PC material (plastic finish), spherical, pear-shaped, cylindrical bulb are non-small cell, non-planar whole shell, light loss is large, light angle is too small.

2.      Because one surface of the lens having horizontal and vertical curvature radius in both directions, it is possible to make the incident light in the horizontal direction and the vertical direction have been spread. Given the radius of curvature in two directions independent of each other, it can upon request, two curvatures were adjusted so that the light output in two directions to obtain different degrees of diffusion. Thus, using two-way curvature curved surface of the lens, can be more freely design distribution of light output, more efficient use of flux, to reduce unnecessary waste and glare. Further, due to the use of a smooth transition surface, a uniform transition lamp light distribution and good looks. Completely transparent PMMA lighting or shade in the center of the light source or cause blinding glare of light strings, but the brightness of the light source has rapidly reduced peripheral. Many social occasions and operating environment lighting must exclude this unpleasant atmosphere or minimize the causes eye discomfort light.

3.      The projection of each lens unit on the body is a rectangular, so that the units can be closely arranged neatly. Parallel beam through the refraction of the lens unit in the horizontal direction is formed symmetrically evenly spread, in the vertical direction is formed downward deflected evenly spread. A lens by adjusting the size of the units and the radii of curvature in both directions, the deployment of a luminous flux in a different solid angle range of the distribution of the light distribution to meet the design requirements.

4.      We have to placed the light source in the inside of the lens, the more light away from the lens, the lens of the light flux collected is more less, and thus the efficiency of the lens system is lower.

Therefore, the focal length of the lens can’t blindly pursue the maximum. The thickness of the lens is not large, so don’t use a Fresnel lens, avoiding the cumbersome and increase the processing costs.