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1. Appearance inspection

1. Appearance requirements: About 0.5 meters away from the lamp, visually inspect the shell, lampshade, and other parts, and there should be no deformation, scratches, wear, paint peeling, or dirt.

. The pin has no deformation; Shake the lamp tube without looseness or abnormal noise 2. Dimensional requirements: The overall dimensions should comply with the drawing requirements 3. Material requirements: The materials and structural design of each part of the lighting fixture shall comply with the requirements of the drawings 4. Assembly requirements: All fastening screws on the surface of the lamp should be tightened without missing installation, the edges should be free of burrs and sharp edges, and all connections should be firm and free from looseness

2. On site testing

1. Switching frequency test

LED lamps can still operate normally after 5000 switching tests under the conditions of 60 seconds on and 60 seconds off when the rated voltage and frequency power supply are applied.

2. Durability test

In a non convective environment with a temperature of 60 ° C+3 ℃ and a maximum relative humidity of 60%, the LED lamp is operated continuously for 360 hours after applying a rated voltage and frequency power supply, and its luminous flux is not less than 85% of the initial luminous flux.

3. Overvoltage protection

Input overvoltage protection, that is, when the input voltage is 1.2 times the rated value, the overvoltage protection device should act; When the voltage returns to normal, the LED lights also return to normal operation

4. High and low temperature working test

The test temperature is -25C and+40C, and the test time is 96+2 hours each

High temperature test

Place the test sample at room temperature in the test box without packaging or power, and then adjust the temperature of the test box to the specified (40+3) ℃.

. At this temperature, the test sample is energized at rated voltage and rated frequency for 96 hours, and the duration should be calculated from when the temperature reaches stability. Cut off the power supply of the test chamber, remove the test sample from the chamber, and restore it to room temperature for 2 hours

Low temperature working test

Place the test sample at room temperature in the test box without packaging and power on, and then adjust the temperature of the test box to the specified (-25+3) ℃.

. At this temperature, the test sample is energized at rated voltage and rated frequency for 96 hours, and the duration should be calculated from when the temperature reaches stability. Cut off the power supply of the test chamber, remove the test sample from the chamber, and restore it to room temperature for 2 hours

Judgment of test results

By visual inspection, the appearance and structure of LED lights should not show significant changes before and after the test. The average illumination of the final detection should not be less than 95% of the average illumination of the initial detection. The deviation between the rectangular area of the illumination distribution map and the initial detection should not exceed 10%, and the deviation between the length or width of any side of the rectangle and the initial detection should not exceed 5%.

, The angle between the length and width of the rectangle and the initial detection should not exceed 5 degrees

5. Free Drop Test

The test sample is packaged completely, without electricity, and can be dropped 8 times from a height of 2 meters, that is, from 4 different directions, twice in each direction

After the test, the tested equipment should be checked to ensure that there is no damage or loosening or detachment of fasteners. The powered on equipment should function normally.

- Color temperature: a unit of measurement that represents the color components contained in the light.

. In theory, blackbody temperature refers to the color of an absolute blackbody that appears when heated from absolute zero (-273 ° C). After being heated, the blackbody gradually changes from black to red, turns yellow, turns white, and finally emits a blue light. When heated to a certain temperature, the spectral composition of the light emitted by the blackbody is called the color temperature at that temperature, The measurement unit is "K" (Kelvin)

If the light emitted by a light source has the same spectral composition as the light emitted by a blackbody at a certain temperature, it is called a certain K color temperature. For example, if the color of the light emitted by a 100W bulb is the same as that of an absolute blackbody at 2527C, then the color temperature of the light emitted by this bulb is (2527+273) K=2800K