1, look at the packaging and trademark. The state mandatory LED lamp manufacturers in the product packaging marked the following: rated voltage, voltage range, rated power, rated frequency. Generally speaking, the quality of high quality products, the quality of the trademark printing is clear and legible, with a soft wet cloth wipe is not easy to erase, and manufacturers of trademarks and related certification mark.
2, look at the appearance of the lamp. Appearance should be no cracks, loose and interface between the pry marks. In the process of mounting and dismounting, the lamp should not be loose or tilt phenomenon. The plastic shell of the lamp must choose the kind of engineering plastics flame retardant type, is characterized by the surface of the sand like glass texture. The ordinary plastic surface is smooth and shiny, but easy to deformation and flammable, is prohibited for the production of energy-saving lamps.
3, look at the state of work. LED lamp is in normal working condition, the temperature rise should be relatively low, if the heat condition is not good, light work under high temperature, light will be great, will greatly reduce the service life of the lamp. At the same time, when the lamp is lit and closed, if there is a quick flashing, also shows that there are quality problems.
4. Listen to the work. Electromagnetic compatibility is an item that must be passed by the electrical equipment, and on the packaging of the LED lamps and lanterns, the electromagnetic compatibility test of the country must be printed. We can use a small test to judge with a simple, short wave radio, when the lights work, put the radio on the nearby radio receiving noise is low, indicating the better electromagnetic compatibility measured lamp. In the quiet environment when listening to the sound of the work of the LED lamps, if you can very clearly hear the sound of the lamp, indicating that the power supply is not very good.