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1.0 Introduction
The emergence of LED lighting has brought about tremendous changes in the lighting industry. LED lights provide millions of color schemes and dynamic effects for scene layout, design and ambience, which are beyond the reach of traditional lighting. Small size, low heat dissipation allows it to be embedded almost anywhere; digital, programmable applications, unlimited creative use and effective management; coupled with long life, energy savings and low maintenance costs, making it a potentially effective solution Program.
The following are typical questions that users need to ask. More details are in Table 1. 
2.0 System Reliability
Most quality standards are associated with the initial performance requirements of LED modules and LED luminaires. The initial luminous flux is measured first, and then the luminous flux is repeated after 25% of the rated life, up to 6,000 h. For example, if the rated life is 20,000h, the lumen maintenance is measured at 5,000h, and if the rating is 30,000h, it is measured after 6,000h. Accelerated testing provides more advanced insight into the light decay of LED modules and/or LED luminaires, and this test method is under consideration. However, it must be borne in mind that maintaining the life and lamp life based on the lumen is two completely different concepts. Based on the lifetime of the lumen maintenance, the luminous flux attenuation of the LED source is integrated with the luminaire; and the lifetime based on the lifetime of the luminaire is related to the physical fault.
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For more information, please refer to "High - tech LED - Technology and Applications" December issue 
industrial Gigabit Ethernet Switch series is packaged in a compact IP40 case that allows either DIN rail or panel mounting for efficient usage of cabinet space.
Without power and wires, can power supply for HD IP Camera, wireless AP, IP phone and so on.
[Source: "High - tech LED- technology and application" December issue / this journal editor Wang Lirong compiled]
This guide is the fourth edition of the guide created under the direction of the Lighting Liaison Group.
The Lighting Liaison Group is an informal group representing the majority of lighting organizations in the UK and has agreed to include its group name in this guidance document and to present a set of common quality standards in the IEC/PAS documents. It is important for LED luminaire users to use the same, standardized quality standards when evaluating manufacturer's claims, and should request luminaire specifications measured in accordance with the new I EC/PAS documents. This allows all stakeholders to make a fair and equitable comparison of claims to the interests of end users, suppliers, designers and manufacturers.
summary
The following terms are used in the guide file:
LED die - LED die (or chip) is the base light source.
LED package - The LED chip is packaged in a suitable package, and the package can be connected or spliced ​​by simple circuit.
LED luminaire - is a complete system that contains all the elements mentioned in Section 1.