How do I measure the quality of a white LED?

The digital multimeter diode gear string can be lit with one battery, or the pointer multimeter x10 resistance string with two batteries can also be lit.

Wouldn't it be clear if you lit it directly with a DC power supply?

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Take a look at the basics of maintenance.

1. Dial the gear of the multimeter to the diode gear (beeping gear) <>

2. Connect the positive pole of the watch pen to the side of the LED light.

3. Connect the negative meter pen to the other side of the LED light.

4. Check whether the LED light can be lit, if not, measure the position of the two watch pens interchangeably, and it is normal to light up.

5. If the LED light is not lit after two measurements, it means that the LED light is broken.

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<> we need to use a multimeter for measurements. The specific method is as follows: the first step is to dial the gear of the multimeter to the diode gear, which is the gear where you can hear the beep; The second step is to connect the positive pole of the watch pen to the side of the LED light; The third step is to connect the negative pole of the watch pen to the other side of the LED light; The fourth step is to check whether the LED light can be lit, if it is not lit, swap the positions of the two watch pens, and measure it again (to prevent the positive and negative poles from being connected and caused by not lighting up), the instructions that can be lit are normal, if the two measurements are not lit, it means that the LED light is bad.

In addition, there may be a situation where it can be lit but turned off when it is lit, and such LED lights are also bad.

Hello dear. First of all, look at the packaging. Regular LED strips will be packed in anti-static coil trays, generally 5 meters per roll or 10 meters per roll, and then sealed with anti-static and moisture-proof packaging bags on the outside.

The copycat version of the LED light strip will be used because of cost saving, and the first coil tray is used, and then there is no anti-static moisture-proof packaging bag, and a careful look at the coil tray can see that there are traces and scratches left when the label is cleared. Second, look at the labels. Regular led strip packaging bags and coil trays will have printed labels on them, not printed labels.

The label of the copycat version is printed, and the specifications and parameters are not uniform. Third, look at the attachments. Regular LED strips will be attached to the packaging box with instructions and strip specifications, and will also be equipped with LED strip connectors or card holders; If my answer is helpful to you, I look forward to your like, your efforts are important to me, and your support is also the driving force for my progress.

If you feel that my answer is still satisfactory, you can click on my avatar for one-on-one consultation. Finally, I wish you good health and a good mood!

The country is paying more and more attention to lighting energy conservation and environmental protection issues, and has been vigorously promoting the use of LED lamps. Obviously, as long as the cost of LED lights decreases with the continuous improvement of LED technology. Energy-saving lamps and incandescent lamps will inevitably be replaced by LED lamps.

Next, PCHOUSE will introduce to you how to check the quality of LED lights.

1: Appearance: This is what ordinary people can do, the appearance is beautiful, and the heat sink design is reasonable;

2: Temperature: Let the lamp be lit for about 5 minutes, the temperature rise is not very fast, and the hand can be placed on the lamp shell for a long time, which proves that the heat dissipation is reasonable;

3: Ask: Ask the seller whether the lamp uses a constant current circuit, and what is the current of a single lamp bead?

Generally, a single lamp bead is 350mA of 1W, and two lamp beads are connected in parallel is 700mA, and so on; For small power, what is the internal temperature of the lamp, generally not more than 60C; For high power, whether PFC is used in the circuit, what is the efficiency, whether the internal capacitor is used for high temperature and long life, high frequency and low impedance capacitor.

4: Judgment of the quality of the lamp beads:

A: Generally speaking, it is not easy to judge the quality of lamp beads, so you can only ask the manufacturer;

B: Which one is used for the lamp bead chip, the 45mil chip is more reliable than the 30mil chip, but it is also expensive;

C: What is the luminous light efficiency, generally speaking, the higher the light efficiency, the lower the heat generation, the more reliable;

Ways to distinguish the advantages and disadvantages of LED lamps:

1. Look at the overall "power factor of lamps": low power factor means that the driving power supply and circuit design used are not good, which will greatly reduce the service life of lamps and lanterns.

Second, look at the "heat dissipation conditions of lamps and lanterns - materials, structure": LED lamps and lanterns heat dissipation is also very important, the same power factor of lamps and lamps of the same quality, if the heat dissipation conditions are not good, the lamp beads work at high temperatures, the light decay will be great, and the life of the lamps will be reduced.

3. Look at the "quality of lamp beads": the quality of lamp beads is determined by the quality of chips and packaging technology.

Fourth, look at the driving power supply used by the lamp, the service life of the power supply is much shorter than other parts of the lamp, the life of the power supply affects the overall life of the lamp, the theoretical life of the lamp beads is 5-100,000 hours, and the life of the power supply is 10,000 hours, the design and material selection of the power supply will determine the service life of the power supply.

5. Look at the light effect: the same lamp power, the higher the light efficiency, the higher the brightness, the same lighting brightness, the smaller the power consumption, the more energy-saving.

Sixth, look at the power efficiency, the higher the power efficiency, the better, the higher, indicating that the power consumption of the power supply itself is smaller, and the output power is larger.

7. To see whether it meets the safety standards, the safety standards for LED lamps and lanterns in China have been introduced, please choose LED lamps and lanterns according to the safety standards stipulated by the state.

8. See whether the workmanship is fine.

A good quality LED lamp, in addition to the main aspects mentioned above, should also have different technical requirements according to different use environments, such as moisture-proof, dust-proof, anti-magnetic, lightning protection, etc.

How to distinguish the *** bad of LED lights? Teach you to use this method, and if you learn it, you earn it.

Use a multimeter to block both sides of the LED lights. It's good when it's on.

Upstairs is right, but only for the general LED lights. It's different if you're talking about *** bad.

1. Test with a multimeter, adjust the watch to the diode gear, and then connect the positive and negative poles of the watch pen with the LED lamp beads on both sides before doing it, and then observe the lamp beads.

2. If there is no pure return to the clear, the two watch world qi pen will be replaced to see if it can be lit, if it is not lit, it means that the lamp bead has been damaged.

3. If it is on and off, it means that it is also bad, and it is always on, which means that the lamp beads are not broken.

With the popularization of LED, more and more people realize the energy-saving and pollution-free characteristics of LED, and begin to choose the preferred lamps and lanterns as LED lamps. When we need to repair these LEDs, we often need to distinguish the good and bad of a chip. Let's introduce it to you.

Observe the appearance of the lamp beads.

Distinguish between the anode and cathode of the lamp bead.

The multimeter gear is set to the "Transistor setting".

The red pen of the multimeter is in contact with the anode contact of the lamp bead, and the black pen of the multimeter is in contact with the cathode contact. Observe if the lights are on.

If the light is on, it means that the lamp bead is basically functionally unhindered, if the light is not on, the red and black pen will be exchanged and tested again. In order to avoid that the cathode and anode of some lamp beads are contrary to the general one.

The lamp beads are lit up to observe the color of the lamp beads and whether the color temperature meets the requirements. Whether the brightness is appropriate. Choose the right lamp beads.