LED light source quality inspection guide manual

At this stage, because the country does not have LED industry standards, the quality of LED products in the market is uneven. In order to protect the rights and interests of users, the following will share how to judge the quality of light source and bad detection methods, and hope to help users.

LED light source quality inspection guide manual

The method is as follows: (In the case of the same shape and brightness), the resistance of the light source is measured by a universal meter, the light with small resistance is large, and the service life is short; the light with large resistance has small light decay and long service life.

1. Identify the piranha module: The resistance of the piranha module white light and red light is generally 150 ohms. After testing the brightness, the customer tests the resistance of the module with a universal meter. If the brightness is no problem, the resistance is greater than or equal to 150 ohms. The piranha module is a module that you can use with confidence. (Conditional users can test the module's current white light is generally less than 20 mA red light less than 40 mA)

2, identify the patch module: white light patch module because the light fade is more and more recognized by the majority of customers, now on the market white light patch is probably super bright and high brightness, super bright resistance is about 90 The -100 ohm (current 30 mA) high-brightness resistor is approximately 120-150 ohms (current 20 mA). If the two resistors have the same brightness, the patch module is the best.

3. Identify the waterproof light string: The main problem of the light string is the quality of the waterproof. It is recommended that the customer use the salt water to soak the light string and test it for more than 100 hours to test the waterproof performance when testing the waterproof light string. The 5V monochromatic string current is generally No more than 20 mA. When the light string is inserted into the lamp, it is easy to have a dead light (because the resistance wire is broken), and the probability of the problem with the light string of the circuit board and the chip resistor is small.

4. Identify the full-color string and use the controller to convert the string into white light to detect the consistency and brightness of the white light. The waterproof test method is the same as the monochrome. The gray level is generally divided into 32 levels and 256 levels, and the 256-level gray color is more vivid and more realistic. Ask the customer to ask for the gray level when purchasing the full color string.

The chip has a rated current value (white light 20 mA red light does not exceed 40 mA). When the current is greater than the rated value, the life of the chip becomes shorter and the brightness is doubled. If an LED product is increased in current The method is to increase the brightness, such high brightness is not sustainable, the light decay can reach 50% or more in 3 months (even the actual test results). Led products vary greatly in cost due to different chip sizes. LED modules used in rated power have a service life of more than 5 years, and less than one year under overload. In order for your company to be able to prosper in the advertising industry, I hope to choose LED products carefully.