The production of copper wire lamp string has been developed from a few in the early days of the founding of the People's Republic of China to hundreds now. The sales market of the lamp string is all over the country and the world. Customers have more and more requests for the style and type of the lamp string. In particular, in recent years, some countries have gradually tended to light up the luminous brightness of the light string and the shape of the bulb, and the shape of the bulb has been increased and changed in a single way, and the current (power) of the bulb in the corresponding light string has also increased in the same share. Therefore, during the inspection or ignition point of this type of bulb, abnormal breakdown of the resistance wire often occurs, which affects the life and operating performance of the light string, and together increases the cost of the manufacturer and affects the economic benefits of the factory.

Check and analyze the photo biological safety characteristics of LED light strings, and evaluate the damage level of the viewing effect. This paper briefly introduces the development process of photobiological safety review standards at home and abroad. This paper briefly introduces the methods of LED light biosafety inspection and the primary physical quantities.

In recent years, the application fields of high brightness LED have been increasing, including mobile device backlight, medium and large standard LCD backlight, car interior and exterior lighting and general lighting. Most common DC-DC LED lighting applications include phenomenon lighting, internal low-voltage road lighting, solar powered lighting, car lighting, vehicle lighting, ship application, low-voltage halogen replacement and aircraft interior lighting. Semiconductor supplies a variety of LED drivers for DC-DC low-power LED lighting, including different topologies such as voltage boost, voltage drop and voltage rise and fall.

The luminous principle and relevant optical characteristics of LED are analyzed and studied, and the measurement scheme of relevant optical characteristics of AC-LED is proposed. Investigation of spectral changes and chromaticity changes under different power supplies shows that under the planning of useful voltage and current, with the increase of useful voltage and current, the photon energy emitted will increase, the PN junction temperature will increase, and the corresponding spectral blue light component will increase, the chromaticity will continue to decrease, the main wavelength will continue to decrease, and the color temperature will increase; At the same useful voltage, with the increase of the instantaneous voltage, the blue light spectrum of AC-LED moves to the short wavelength direction, and the color coordinate x increases and the color coordinate y decreases. Chromaticity, main wavelength and color temperature shall remain unchanged under the same instantaneous voltage.

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