Do you feel your head buzzing when you stare at the large LED screens ranging from 30,000 to 300,000 on the quotation? Don’t panic! Last month, I just helped Lao Zhang, a chain supermarket chain, avoid a big pit - he almost spent 180,000 yuan to buy a screen with virtual label parameters. Later, he chose the method I said, not only saved 50,000 yuan, but the screen effect was improved by two levels. Today I will give you all these dry things.

▎First understand these five must-have questions
​​The first soul-strike question:​How many years can the lamp beads on your screen not fade?
Anyone who knows it requires it​LM-80 Aging Test Report​​, this thing can show the degree of manufacturing tolerance of the lamp beads. There is a typical case of a shopping mall manager. The screen he bought had a color block fault in two years. When he opened it, he found that the attenuation of the lamp beads exceeded the standard by 3 times. Remember, dare to provide​50,000 hours of no decay promiseThe manufacturer is reliable.

​The second killer move:​Will the outdoor screen become dumb when it rainstorms?
Let the sales demo directlyIP65 protection test​, the authentic outdoor screen will still be bright after soaking in water for half an hour. Last year, a gym was greedy for cheapness and short circuited when the screen was raining. The repair fee was twice as expensive as the difference.

​The third axe:​Does the after-sales team be on standby 24 hours a day?
Focus on whether the other party has itLocal service outlets​, if you arrive at the site for two hours and wait for three days in an emergency, the losses are not the same order of magnitude. There was a bar owner's LED floor tiles screen before the performance. Fortunately, the manufacturer had a night response team, and the emergency repairs happened to be the beginning.

▎Don't sign the parameter comparison table
Here is a decoder for industry slander:

Special reminder:​Low bright high gray technology​is a hard-core indicator. When the indoor screen is turned on at 800cd/m², the gray level cannot be lower than 16 bits. Some manufacturers have beautiful parameters, but they are actually like masked fog, which means that the grayscale does not meet the standards.

▎Installation and acceptance Pit prevention guide
These three magical tools are brought during acceptance:

1. ​​Laser rangefinder​(Check the splicing seam ≤0.5mm)
2. ​Colorimeter​(Color measurement difference ΔE＜3)
3. ​Oscilloscope​(Look at the refresh rate is not real)

The most amazing case I have ever seen is a certain exhibition screen. It looks normal to look at the naked eye. I found out after using an instrument.​Color temperature deviation 500K​, the lighting of the entire booth must be re-adjusted. Remember,Color consistency at 5% brightness​This is the real skill. Many screens become distorted when they dim.

Editor's opinion: Next time I encounter a salesperson boasts about "imported chips" and "military quality", and ask him to show it directlyCustoms declaration formand​Salt spray test report​. Real gold is not afraid of fire and manufacturers who dare to spread out laboratory data are real people who do things in a silence.

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