At present, LED is increasingly used in daily lighting. From outdoor lighting to indoor lighting , the footprint of LED lighting products can be seen. With the decline of LED cost, LED lighting products are no longer limited to road lighting. In the market, LED self-ballasted lights, LED fluorescent lamps and other LED products that meet the purchasing power of the masses have begun to appear. The structure of the ballast fluorescent lamp and the double-end fluorescent lamp can be conveniently installed directly on the traditional home lighting, and will not add extra lighting purchase cost to the public.
Due to the relatively fast speed of LED products, many LED products have no corresponding safety standards to date. It is not comprehensive or suitable to use the safety standards of traditional lighting sources. This will lead to the safety design of many LED products. There are problems with the failure to affect the safety and quality of LED products.
At present, the common LED fluorescent lamps are basically designed with reference to the fluorescent lamps of T8 and T10. The different places are mainly different materials for the light source. The LED fluorescent lamps have built-in power supply and the traditional double-ended fluorescent lamps are excited by external ballasts. From the electrical point of view, LED fluorescent lamp is not only a light source, but also like a luminaire. It must meet the requirements of the lamp head part size and heat resistance and fire resistance in the double-end fluorescent lamp safety standard GB18774-2002. It also needs to meet the lamp standard GB7000.1-2007. Standard and GB 19510.1-2009 standards for the entire lamp and built-in LED drive power requirements on structure, internal wiring, creepage distance and clearance, insulation and electrical strength, heat resistance, fire resistance, etc.
First, the structural aspects
LED fluorescent lamps are prone to problems in three places: the lamp cap, the screw, the basic insulation and the contact with the accessible metal parts. The lamp cap needs to meet the torque test specified in GB18774-2002 and the dimensional requirements specified in GB2799-2001. Among them, the torque test specified in GB18774-2002 requires that the high temperature test must comply with the provisions of 2.3.1 of the standard, that is, when the torque test is applied, the rotation between the parts of the lamp head does not exceed 6 degrees. The high temperature condition applied by the lamp holder was 125 ° C and the heating time was 2000 h. If the G13 base is used and the lamp power is greater than 40W, the high temperature condition is: 140 °C.
High temperature conditions and duration The evaluation of LED fluorescent lamps using plastic materials for the lamp head is harsh. Using plastic lamp caps with low heat resistance, after applying such high temperature conditions for a long time, it is likely that the plastic parts have softened. If a metal base is used, it is relatively easy to meet the test conditions, but it is also necessary to consider the connection between the metal base and the LED fluorescent lamp body and the creepage distance and clearance.
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