Second, the comparison of evaluation methods
The characteristics of LED downlights are significantly different from those of lamps using conventional light sources. Traditional light sources, such as fluorescent lamps, gas discharge lamps and other light sources, are basically products with mature production technology and relatively complete product specifications. The indicators of the light source have also been standardized. Therefore, for lamps using traditional light sources, power measurement And evaluation is also relatively easy, in the product standard of the luminaire, the type test can only measure one luminaire. LED is an emerging light source in the lighting industry. It is still in the stage of technology development. The characteristic stability of LED light source and various technical indicators have not yet formed mature technology. There is no standardized product, including the power, specification and light intensity of LED light source. The uncertainty of parameters such as lamp performance, input current and voltage brings measurement instability to lamps using LED sources. Therefore, the traditional method of evaluating a lamp sample is obviously not suitable for the measurement requirements of LED downlights.
Many local standards and technical specifications have been formulated in China, and two of them have a wide range of technical specifications. First, the semiconductor lighting products jointly issued by the National Development and Reform Commission, the Ministry of Housing and Urban-Rural Development, and the Ministry of Transport in August 2010. Technical Requirements (2010 Edition) (hereinafter referred to as technical requirements). The other is the LED Downlight Energy Saving Certification Technical Specification (hereinafter referred to as CQC Technical Specification) issued by CQC in December 2010.
At present, various standardization organizations in the world are studying the evaluation methods of LED luminaire performance. The IEC/PAS 62722-2-1 (ED1.0) LED luminaire performance standards drafted by the IEC/TC 34D Standards Committee describes the use of statistical evaluation methods in the IEC/TC 34D Standards Committee LUMAX Maintenance Working Group 2011 At the technical meeting held in June, many experts proposed to use the average instead of the concept of statistics. Table 4 lists the above evaluation methods.
Neck bluetooth headset - a bluetooth headset with headphone cables or accessories running from the neck to the ear when wearing. It is a product developed in recent years.
Born: in order to solve the boring when running or control the exercise rhythm, many people choose to listen to music,however, experienced people all know that because of the swing in the process of exercise, the earphones are easy to fall off, which makes it difficult to run coherently and constantly ,under this circumstance, the Bluetooth Neckband Headphones was designed.
Features:
1: There is no restrained from headphone cables.
2: In line with the development trend of headphones: From the perspective of the development trend of consumer headphones, bluetooth neckband headphones should be regarded as the general trend. Whether it is sports headset or head-worn headset, many manufacturers are vigorously developing bluetooth headset to occupy the market.
3: Not affected by audio interface
More and more flagship mobile phones are also trying to cancel the audio interface, which is the important reason for the generation of bluetooth neckband headset. As long as the device that supports bluetooth music play is ok, the audio interface will not be considered.
4: No burden when running
Sports neck hanging bluetooth headset is light and easy to wear, more convenient and fast storage, no knot, more relaxed entertainment sports, let you run zero burden.
5: Waterproof and sweat-proof are very important
When exercising, people will sweat a lot, which may cause some damage to the ears. The bluetooth neckband headphones adopts the IPX5 waterproof design, which is more suitable for sports scenes. Especially in summer, when sweat is easy to happen, it is necessary to use the bluetooth neckband headphones.
Bluetooth Neckband Headphones
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