First, the status of LED North American standards
LED energy-saving lamps as a new type of products, the current North American product safety standards do not specifically address the technical requirements of such products, LED product testing has become a topic in the industry. For the current industry situation, UL Labs of the United States is organizing the preparation of LED energy-saving lamp safety certification standard UL8750, which is still drafted and has not been officially adopted as the certification standard. Therefore, the certification test problem of LED energy-saving lamps has not been completely solved.
The basic principle of the LED energy-saving lamp is to convert the AC power to DC power through the switch-type power module to supply power to the LED. According to the basic principle and structural characteristics of LED energy-saving lamps, MET Labs of the United States proposes a transitional detection scheme at the present stage: the US certification standard UL1993 (corresponding to the Canadian standard CAN/CSA-C22.2No.0, CAN/ CSA-C22.2No.74), and power module standard UL1310 or UL1012 (corresponding to Canadian standard CAN/CSA-C22.2No.107) test and certification of LED energy-saving lamps.
Second, the technical points in the test
The following is a description of the key issues in the LED energy-saving lamp certification test based on the UL1993, UL1310 and UL1012 standards.
1. material
The LED energy-saving lamp can be made into various shapes. For example, the fluorescent tube type LED energy-saving lamp has the same shape as the ordinary fluorescent tube, and the power module and the light-emitting diode are enclosed by the tubular transparent polymer casing of the fluorescent lamp. The transparent polymer housing provides fire and shock protection in the product. According to the standard requirements, the energy-saving lamp housing material must reach the V-1 level or above, so the transparent polymer housing must be made of V-1 or higher.
It should be noted that the product casing must meet the required V-1 rating, and its thickness must be greater than or equal to the thickness required for the V-1 grade of the raw material. The fire rating and thickness requirements can be found on the UL yellow card of the raw material. . In actual testing, it was found that in order to ensure the brightness of the LED lamp, the manufacturer often made the transparent polymer casing thin, which required the inspection engineer to ensure that the material meets the required thickness of the fire rating. Since different raw materials have different thickness requirements for the same fire rating, some raw materials can meet higher fire rating requirements at a lower thickness. It is recommended that the manufacturer can select the appropriate raw material for the product casing.
2. Drop test
According to the requirements of the product standard, the product should simulate the drop test that may occur during the actual use, and the product should fall from the height of 0.91 m to the hard board. The outer casing of the product should not be broken to expose the dangerous parts inside. This strength requirement must be considered when the manufacturer selects the material for the product's outer casing.
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