Research on Detection Method of Photoelectric Color Performance of LED Lighting Products

In recent years, with the continuous development of LED technology , high-power semiconductor lighting devices have been rapidly developed in recent years, especially the white light power and light efficiency continue to increase, LEDs gradually enter the field of lighting, triggering a new revolution in the field of lighting technology. . LEDs are arranged and combined in different ways and optical design, forming a variety of LED lighting products, and the research and development of LED lighting products are in full swing in China, and the performance level of LED lighting products is gradually improving. Under the premise of adopting the correct test method, accurately measuring the photoelectric color performance parameters of LED lighting products is the basis for scientific evaluation of product performance, quality status and development trend. In view of the current status of photoelectric color performance testing of LED lighting products, the author combined with the accumulation of LED products in the work of the center, and combed and summarized the detection methods of photoelectric color performance of LED lighting products.

First, the general evaluation of LED lighting product performance indicators

1. Classification of LED lighting products

LED lighting products can be divided into LED lighting (e.g.: LED road lamps, LED floodlight with embedded LED lamps, LED tunnel lighting, decorative lighting LED, LED lamps) and substitute traditional lighting LED lamp (e.g. : Self-ballasted LED lights, MR16, PAR lights, straight tube LED fluorescent lamps T8/T12, etc.). LED lighting fixtures are those that include LED-based lighting elements and mating drivers, light distribution components, components that secure and protect the lighting components, and complete lighting fixtures that connect the appliance to the branch circuit components. LED lamps for lighting can be divided into two types: non-integrated LED lamps and monolithic LED lamps [10].

Non-integrated LED lamps contain LED arrays (modules) or LED packages (components) and standard lamp caps as well as other components of photometric, thermal, mechanical and electrical components. The LED light needs to be installed in a fixture with a standard lamp holder and LED driver . The LED light cannot be directly connected to the branch circuit.

Integral LED lamps contain an LED array (module) or LED package (component), LED driver, standard lamp head and other integral combinations of photometric, thermal, mechanical and electrical components. The LED lamp can be mounted directly on a standardized lamp holder and can be connected directly to the branch circuit. The biggest difference between LED lights and LED lighting is that LED lights need to be installed in standard lamp holders.

2. Differences between LED lighting fixtures and traditional light source fixtures

At present, LED lighting and traditional light source lamps are different in many aspects. First of all, the life of a conventional light source luminaire can meet the requirements by replacing the damaged light source and the lamp control device, so the life of the conventional light source luminaire is generally not evaluated. The LED lighting fixture is integrated with the LED light source and the lamp housing. At present, the life of the LED lighting fixture is related to the life of the LED light source itself, the LED driver and the environment in which the LED is provided to the LED. For different LED luminaires, their lifetime can only be determined by the relevant life characteristics evaluation.

Secondly, unlike traditional light source lamps, LED lighting fixtures use multiple LED light sources or module illuminants to form and illuminate. There are color differences between illuminants in LED luminaires. Color space uniformity evaluation is needed to evaluate LED luminaires. The spatial distribution of the color evaluates the difference in color of the different viewing angles of the LED luminaire.

Again, traditional illumination sources can be individually tested for photometry, and relative methods can be used for photometric measurements. Due to the integration of LED lamps and the extreme sensitivity of the LED light source to the temperature, it is not suitable to separate the LED light source from the lamp and measure it separately. For the photometric measurement, the overall brightness of the LED lamp should be tested by the absolute method.

Fourth, traditional lighting fixtures are evaluated with luminaire efficiency, while LED luminaires are evaluated using energy efficiency or efficacy.

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