Hey, what on earth is this thing?

Do you often see that long red screen with flashing words on the roof of a police car on the road? ​ ​This professional equipment is called a long police light LED display​ ​, to put it bluntly, it is an information display tool dedicated to special vehicles. It can display warnings such as "On duty" and "Avoid ahead", which can be a life-saving tool at critical moments.

But here’s the problem—ordinary people don’t know where to buy this equipment. Search on Taobao? Afraid of buying fake products. Ask an acquaintance? People don’t know how to do it either. Don't worry, today we will break this matter apart and explain it clearly.

Several hard indicators that you must understand before buying

​​Here comes the point​ ​, this is no ordinary LED screen! Equipment for special vehicles must meet three major life and death requirements:

1. ​​Waterproof and impact-resistant enough​ ​: It must reach the IP65 protection level and cannot be short-circuited when soaked in water for half an hour during heavy rain.
2. ​​Strong temperature tolerance​ ​: Frozen into popsicles at minus 20℃, it has to work normally even when exposed to the sun to 70℃
3. ​​Instant response​ ​: The time from power on to display of complete information cannot exceed 3 seconds.

For example, when a transportation department in Southeast Asia was purchasing products last year, they encountered an embarrassing situation where the screen was damaged during heavy rain. Later, I switched to a reliable manufacturer and directly conducted a 72-hour salt spray test on the equipment before it passed the test.

How to choose reliable purchasing channels

There are many ways to do this. Let me draw the key points for you:

• ​​Official direct sales are the most reliable​ ​: Directly look for manufacturers with military qualifications, remember to look for ISO9001 and CCC certifications
• ​​Don’t miss professional exhibitions​ ​: At industry events like the Shenzhen Optical Expo, you can touch real machines and compare parameters.
• ​​Project contractors should be cautious when cooperating​ ​: Not to mention that middlemen make a profit from the price difference, it is easy to argue when something goes wrong.

A friend went to a second-hand dealer for a bargain, but the device he bought had a refresh rate of only 800Hz, and when the police lights flashed, the screen was full of smear. Later I found out,​ ​The refresh rate of professional police screens must be at least 1920Hz​ ​To ensure dynamic clarity.

Don’t step into these pitfalls during installation and maintenance

Do you think that’s it after you buy it? ​ ​Installation is the highlight​​！

1. ​​The wiring should be hidden​ ​: Power cables and signal cables must be hidden in the mezzanine of the car roof, otherwise they will be easily damaged.
2. ​​Leave space for heat dissipation​ ​: Leave at least 5cm ventilation space on the back of the screen
3. ​​Debugging needs to be meticulous​ ​: The color temperature should be adjusted to 6500K true white. Too blue or too red will affect the recognition.

Remember, the team equipment used in an international competition last year did not have good heat dissipation in the equatorial region, and the brightness of the screen deteriorated after two months of use. Later, the manufacturer solved the problem by adding aluminum alloy cooling fins.

personal opinion time

Having been in this business for more than ten years, I have seen too many people fall for petty gains. ​ ​Special equipment really can’t save thousands of dollars​ ​, it is no joke to fall off the chain at a critical moment. Nowadays, some manufacturers can provide a three-year warranty for the entire machine and can remotely diagnose faults. This kind of service is worth paying for.

By the way, some high-end models already support voice control. The personnel on duty can switch the displayed content by shouting a word, which is much more reliable than using the mobile APP. But having said that, the more functions there are, the greater the chance of failure.​ ​Solid basic functions are the way to go​ ​ah!

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