Why are the prices of the same LED digital screen 3 times different?

You may not know that the purchasing department of a shopping mall in East China suffered this loss last year - looking at the P10 character screen with the same parameters, House A quoted 380 yuan/square meter, while House B dared to ask for 980 yuan. After installing it, I discovered that the cheaper one used inferior lamp beads, and 20% of the modules were damaged in half a year. ​ ​Here comes the point​ ​: The combination of letters and numbers in the model number hides knowledge, such as the number NS-P10-1920H. The "H" in the suffix represents high refresh rate. Screens with this logo will not cause ripples in videos.

Three correct ways to check the model number

​​1. Official website verification trilogy​​
・Don’t just read the promotional brochure, go straight to "Technical Support" to download the specification sheet
・Check three key codes: product model + production batch + certification number
・Tips: Enlarge the official website display image 5 times to see if the pixels are arranged neatly

​​2. Physical prototype verification method​​
・Bring a USB flash drive to save the test video (red, green, blue and white solid colors + dynamic text)
・Focus on grayscale transition. A good screen can distinguish 16 levels of grayscale.
・Touch the heat dissipation holes with your hands. Be careful if the temperature difference is >8℃ after 1 hour of work.

​​3. Industry database comparison​​
・Log in to the 3C certification official website and enter the model number to check the authenticity
・Remember to check CE or FCC registration information for cross-border products
・Teach you a trick: Compare the weights of three products with the same parameters. If the error exceeds 15%, there must be something fishy.

Model parameter decryption manual

​​Give a chestnut​ ​：DS-IP65-F800-P5-1920H
・​ ​DS​ ​=Suspended structure (WD is wall-mounted, FL is column)
・​ ​IP65​ ​=Dustproof and waterproof level (don’t reverse the first two digits)
・​ ​F800​ ​=Maximum brightness 800cd/m² (don’t believe the nonsense about “adjustable brightness”)
・​ ​P5​ ​=Pixel pitch 5mm (no digits after the decimal point are integers)
・​ ​1920H​ ​=Refresh rate 1920Hz (less than this, the video will be overturned)

Tips for preventing pitfalls from procurement veterans

・When you see the words "upgraded version", ask first what is the upgraded version (80% of them are downgraded versions)
・The nominal life span is 50,000 hours, depending on the test environment temperature (the difference between 25℃ and 40℃ is twice the life span)
・When signing a contract, the full model name must be stated. Whether it contains "Pro"/"Plus" or not makes a big difference.

A shopping mall in Southeast Asia suffered a dark loss - the P6 character screen written on the purchase order was found to be a mix of P6.8 when it arrived. Although the difference was only 0.8mm, the clarity of the entire screen was directly downgraded. Later, I learned to be smarter, and now I always bring a vernier caliper with me when inspecting, and randomly test the spacing of 20 pixels.

Let me tell you, checking model numbers is no longer a technical job now, but more like a treasure hunting game. Those manufacturers who mark their parameters in a vague way probably have something to hide. Remember, good products want you to check the model number thoroughly, but only inferior products will scare you from being serious. Next time I meet someone who hesitates and refuses to hand over the specifications, I will turn around and leave. That’s right!

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