Are you also having a headache - how much does it cost to install LED screens in tunnels? Why do water mist appear in some projects three months after installation, and the maintenance fee is higher than the original quotation? Today we will break it down and talk about it thoroughly. After reading it, we can save at least three years of detours.

▍​​The tunnel screen is no ordinary display screen​​
A friend from the engineering team complained to me two days ago that the LEDs they purchased according to the standard of ordinary outdoor screens had color blocks and faults on the screen just two months after they were installed in the tunnel. Later, when I dismantled the machine, I discovered that​ ​Poor ventilation 24 hours a day in the tunnel + exhaust gas corrosion​ ​, the protective coating of ordinary screens simply cannot withstand it. A serious tunnel special screen must do the following:
• Surface anti-corrosion treatment ≥ 3 layers (acid-base test takes 48 hours)
• The cooling system supports lateral convection (avoiding heat accumulation on the top)
• Automatic brightness adjustment range 300-1500nit (to cope with day and night light changes)

▍​​What tricks are hidden in the quotation? ​ ​
Many suppliers will hide 20% of their costs in places you can’t understand:

1. Structural supports are quoted by the meter (lateral reinforcements must be added during actual installation)
2. The control system only talks about the basic version (later upgrades will require additional decoding fees)
3. The warranty period only covers lamp beads (driver power supply and chip are not included)
   Last year, a high-speed tunnel project suffered a loss. The contract was signed for 3 million, and an additional 800,000 was spent on later additions. Now regular manufacturers dare to give​ ​All-inclusive price list​ ​, everything from embedded parts to signal amplifiers is clearly listed.

▍​​These three parameters must be adhered to​​

▍​​Construction plan determines success or failure​​
The most outrageous case I have ever seen: After the screen was installed, I discovered that the maintenance truck could not drive in, and the road had to be closed for two hours for each maintenance. The current advanced approach is:

1. Use BIM modeling to simulate installation in advance (avoiding ventilation ducts and fire protection facilities)
2. Adopts quick-release box design (a single module can be replaced in 5 minutes)
3. Pre-embedded dual-channel power supply (automatic switching of main and backup power supplies ≤0.3 seconds)
   A tunnel project in Zhejiang relied on these three methods to reduce daily maintenance costs by 47%.

▍​​After-sales team is more important than equipment​​
You may not believe it - 70% of tunnel screen failures are caused by human operations. One manufacturer’s after-sales records show:
• 32% of repair reports are due to parameter setting errors
• 28% are due to the use of corrosive solvents during cleaning
• 15% comes from grid voltage fluctuations
Nowadays, reliable service providers will provide​ ​24-hour remote diagnosis​ ​, some can also adjust the gamma value online, without the need for engineers to go to the scene.

Editor's point of view: Choosing a tunnel screen is like choosing a surgeon. It is useless to just look at the equipment. The key is to see whether there are successful cases. The manufacturer must provide the label next time​ ​Acceptance report for similar projects​ ​, it is best to go to an already built project and check out the display effect during the evening rush hour - whether the screen will be reflected due to car lights, this is the real skill.

for more product information and pricing, please contact us .