"The display screen that Lao Zhang bought at the wholesale market last month was blackened after just half a month after it was installed! "This is the real complaint I heard in Building Materials City. In the past three years, the purchase volume of LED outdoor screens has soared by 137%, but there are more and more cases of novice novice losing their pitfalls. How to buy it to save money and worry?

1. Hard indicators that must be understood before purchasing

​​Brightness is like the lifeblood of the display​ ​, especially in a sunny and vicious place like Shenzhen. Some businesses will fool "the higher the brightness, the better", but in fact, it depends on the specific scenario:

• Pedestrian street windows are sufficient for 4000-5000cd/m² (equivalent to 1/2 of the brightness of the noon sun)
• High-speed elevated advertising space must be above 7000cd/m² (otherwise it will be a blackboard during the day)

​​Waterproof and dustproof are not metaphysical​ ​, 37% of the fault screens last year were sealed and failed. I will teach you a method of earth - use a flashlight to shine the seams of the box, and water will definitely seep in the places where the light leaks. Be sure​ ​IP65 protection certification​ ​, this sign means that it can withstand heavy rain and wash.

2. The light and dark competition of purchasing channels

Online purchasing may seem cheap, but you may not know:

• 30% of the "new screens" on a certain e-commerce platform are actually refurbished goods
• The probability of the module falling off due to bumps in the logistics process is as high as 18%.

The advantage of offline physical stores is that they can test on the spot:

1. Use your phone camera to shoot videos in front of the screen to see if there is any scanning line (the refresh rate is ≥1920Hz to pass)
2. Let the store demonstrate the quick disassembly of the aluminum, magnesium, zinc box be disassembled in 10 minutes

There is a detail that a person in the industry understands: Please read it​ ​Factory quality inspection report​ ​grayscale level in. The real low-bright high-gray technology can also see the level of the picture clearly in the evening, unlike the inferior screen.

3. Life and death line for installation acceptance

Last week I went to an industrial park in Longhua and saw the construction team cut corners with their own eyes:

• The 304 stainless steel bracket is replaced with galvanized iron pipe
• The power cord diameter shrunk by 0.5mm² caused three burns in half a year

Remember these three tough acceptance tips:
① Using infrared thermometer to measure the temperature of the box, there is absolutely a problem if it exceeds 55℃
② Go to watch the screen at 2 a.m., the color difference is more obvious than during the day.
③ Let the workers do a 48-hour aging test in person, and the dead light rate exceeds 0.03% will be rejected directly

"Can you buy online shopping screens? "This is the most asked question recently. My advice is: Find a supply​ ​Full life cycle service​ ​suppliers. For example, some manufacturers will remotely guide the installation, and even send technicians to bring thermal imagers to inspect the circuit - this is really reliable.

There is a data that may subvert perception: the 2024 industry report shows that the comprehensive cost of LED screens purchased through formal channels is 41% lower than that of miscellaneous brands in five years. Because it saves the invisible expenses of repeated repairs, not to mention the risk costs that affect business. Next time I pass by those big advertising screens that are endless day and night, I might as well take a look - what is flashing is not only the lights, but also the spark of product selection wisdom.

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