current graph on the datasheet that looks like the graph to the right. When driving an in-between drive current that is not listed, find the relative flux vs. Factors such as luminous efficiency, lens shape and size, and lens material should be considered in the design to obtain the best luminous flux. Figure 5 LED Luminous Flux Chart For the sake of this example, say we want to run this LED with a 2100mA BuckBlock LED driver and we need to find what the light output would be like. In LED lens design, optical tools such as various types of software are used to analyse and adjust different factors in order to get the most suitable lens design and ensure that the performance of the lamp is maximized and the engineer's objectives are met. Optical design not only improves the performance of LED lamp products, it also improves the marketability of LED lamp products. The optical design ensures that the lamp works best and increases the efficiency of luminous flux production and use. For LED lamp manufacturers, optical design is an important part of developing lamps and related products. Luminous flux has an important place in optical design. Differences in lens material can cause light to be scattered or reflected in different ways, thus affecting the production and efficiency of luminous flux. The material of the lens also has an effect on the luminous flux. Light intensity in lumens, color and spectral distribution of larger size light sources and fixtures can be measured by attaching the LED tester to a Gigahertz. However, if not designed correctly, the lens may also cause light to be scattered or reflected, thus reducing the efficiency of the luminous flux. Typically, the larger the lens size, the greater the luminous flux will be. The shape and size of the lens has an effect on the luminous flux. A direct and a combined method for luminous flux maintenance projection are proposed the latter allows the use of luminous flux maintenance data obtained for both the lamp or luminaire being tested as well as the LED sources used in it. The higher the luminous efficiency, the brighter the lamp will be and the more luminous flux it will produce. A balance was sought between testing time and effort on one side, and sufficient statistical rigor on the other. What are the factors affecting luminous flux? ?įirstly, the luminous efficiency of the LED chip has a great influence on the luminous flux of the lens. The luminous flux of an LED lens depends on a number of factors. This value can be used to measure the brightness and efficiency of an LED lamp. The luminous flux of an LED lens is usually the total brightness of the light beam produced by the lens after it has been passed through and focused, usually measured in lumens (lm).
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