What Tunnel & Bridge Emergency Light Covers
100 lights × lead-acid × 5-8 replacements in 10 years = ¥300,000–500,000 maintenance. More critically, each road closure carries traffic safety risks — workers in traffic, frequent accidents. For owners, battery value isn't "cheap" but "installed and never touched again."
Professional Battery Solutions
¥30~50 10-Year Maintenance-Free — Save ¥300,000–500,000
Tunnel lights at 4m require lane closure + aerial platform each time. Lead-acid 100 lights × 5-8 replacements in 10 years = ¥3,000–5,000/lamp each. Hidden cost: road closure approval requires advance filing, traffic management — approval and time costs far exceed maintenance itself.
PLB long-life version designed for 10 years (GB/T 36276 tested). 100 lights: 10 years zero replacement = zero road closures = zero traffic safety risk + zero approval costs. Save ¥300,000–500,000 in maintenance — far exceeds purchase price difference for transport authorities.
| Lead-acid | PLB long-life | |
|---|---|---|
| Replacements | 5–8 | 0 |
| Maintenance cost | ¥300,000–500,000 | ¥0 |
| Road closures | 5–8 | 0 |
| Safety exposure | Every closure | Zero |
+ 10 IP67 + UV + Salt Spray — 10-Year Housing Without Aging
The pain is specific: + 10 IP67 + UV + Salt Spray — 10-Year Housing Without Aging In daily operation, lead-acid or manually managed packs lose capacity between scheduled checks, maintenance teams cannot inspect every unit, and the failure surfaces only when the load is already at risk.
PLB outdoor IP67 (temporary immersion OK) + UV housing, 1,000hr UV test ≈ 10 years. PLB's LiFePO₄ pack and BMS monitor cell voltage, temperature and SOC continuously, alert before a weak cell becomes a failure, and are sized to the application's load profile.
| Conventional / manual | PLB LiFePO₄ | |
|---|---|---|
| Monitoring | Periodic checks | Continuous BMS |
| Fault warning | At failure | Threshold alerts |
| Maintenance | Scheduled visits | Exception-based |
| Service life | 2–3 years | 6,000+ cycles |
Harbin to Haikou — One Model for All Climates
Northern tunnels at -25 °C — batteries lose 60%+ capacity, backup drops from 90 to under 30 min, severely non-compliant. Southern bridges exceed 60 °C — batteries age to 1–2 year lifespan. Different regions need different models — complex procurement and high inventory costs.
PLB wide-temperature -30 °C to 65 °C — -25 °C efficiency ≥75%, 60 °C 3000 cycles ≥80%. IEC 60068-2-7 thermal cycling 100 times zero degradation. One model nationwide — procurement simplified 80%.
| Regional variants | PLB wide-temp | |
|---|---|---|
| Operating temperature | 0–40 °C | −30 to 65 °C |
| Discharge at −25 °C | Cannot operate | 75% or more |
| Cycles at 60 °C | 500, then scrap | 3,000 at 80%+ |
| Purchase SKUs | 3–5 by climate | 1 |
Solution Advantages
10-Year Life
3000+ cycles, zero replacement
Tested to GB/T 36276 with a ten-year design life, delivering zero replacements and zero maintenance and saving ¥300,000–500,000 across 100 lamps.
In-house long-life cell lines · Ten-year design lifeIP67+UV
Immersion-proof + UV resistant
Immersion-safe construction with 1,000 hours of UV testing, UL 94 V-0 flame rating and 316 stainless terminals covers a decade outdoors, including 5,000 hours of coastal salt spray.
In-house outdoor protection · 5,000 h salt spray, coastal versionFull Range
Harbin to Haikou, one model
One model covers −30 °C to 65 °C nationwide and passes 100 thermal cycles to IEC 60068-2-7 without degradation.
In-house wide-temperature chemistry · One model for all climatesZero Closure
10 years, zero road closures
Ten years of maintenance-free operation means zero road closures, removing the traffic-safety exposure and the permit cost of every closure.
Far more valuable to the roads authority than the price difference · Hidden costs removedFrom Selection to After-Sales — PLB Stays With You
Four commitments that apply to every page in this category, from the first technical question to long-term support.
Technical Selection Support
Engineer recommends within 24 hours
Tell us the number of lamps, the required duration and the installation environment — our engineers size the pack and recommend the matching model within 24 hours.
Dedicated technical team · 24-hour response
OEM / ODM Customization
From cell to cabinet, fully customizable
From cells, BMS, housing and terminals to the nameplate, everything can be customized.
4–8 week customization · Tooling development supported
Global Shipping
Export to 100+ countries
Export-compliant packaging with UN 38.3 air transport certification and worldwide delivery.
UN 38.3 certified · MSDS available · Export compliant
Warranty & Support
Standard warranty, lifetime support
Standard products carry a full warranty, backed by lifetime technical support.
Warranty terms on request · Lifetime technical supportWhy Choose PLB?
Years of Manufacturing
Founded in Dongguan, China in 2014
Countries Served
Export-compliant packaging and worldwide delivery
Voltage Platforms
From 25.6V to 512V, built on the same cell platform
After-Sales Rate
Monitored by the internal quality traceability system
Full Range & Model Selection
Complete product range and model selection — commercial wall and ceiling units, industrial IP65 versions, explosion-proof enclosures and N+1 hub panels for transport.
| Model | Rated backup | Form factor | Environment | Applications |
|---|---|---|---|---|
| LL-EL90-36 | 90 min | Wall · ceiling | 0–40 °C indoor | Commercial buildings · malls |
| LL-EL90-48 | 90 min | Wall · ceiling | 0–40 °C indoor | High-rise · large floor plates |
| LL-EL90-36S | 90 min | Wall · ceiling | 0–40 °C indoor | Smart version · RS485 to BA |
| LL-EL-IND60 | 60 min | Wall · pole | Dusty · corrosive | Factories · warehouses (IP65) |
| LL-EL-EX60 | 60 min | Ex enclosure | Zone 1 / 21 | Hazardous areas · petrochemical |
| LL-EL-WT90 | 90 min | Wall · ceiling | −30 to 65 °C | Cold storage + hot workshop |
| LL-EL-HUB90 | 90 min | Hub panel | 0–40 °C indoor | Metro · airport N+1 redundant |
| LL-EL-SMART90 | 90 min | Wall · ceiling | 0–40 °C indoor | ISCS-connected hub lights |
By project size: single floor → LL-EL90-36.
By environment: commercial interior → LL-EL90 series.
Not sure? Send us the number of lamps, the required duration and the installation environment — our engineers will size the system directly.
Frequently Asked Questions
The questions lighting contractors and safety managers ask most about LiFePO₄ emergency-lighting batteries in the Tunnels & Bridges scenario — IP67 (UV and salt spray) and 10-year (design life), and what it takes to qualify.
What has to change on the luminaire before a LiFePO₄ pack goes into the Tunnels & Bridges scenario?
The 36 V and 48 V packs match common lead-acid emergency-lighting voltages with the same terminal layout and mounting, and the BMS manages charge limits so standard emergency-lighting chargers can be used. Typical models for Tunnels & Bridges builds are LL-EL-LONG90 and LL-EL-OUT90.
Does output stay flat through a whole Tunnels & Bridges discharge cycle?
The pack holds its rated backup duration for the full service life instead of losing capacity after the first year, which is where lead-acid normally fails inspection.
How is the pack sealed and thermally managed in Tunnels & Bridges duty?
Specification: IP67 (UV and salt spray). Sealed construction keeps dust and moisture out, and the BMS cuts charge and discharge at the thermal limits. Endurance: 10-year (design life).
Is a special charger needed in the Tunnels & Bridges scenario?
Standard emergency-lighting chargers are compatible; the BMS controls charge voltage and current and keeps the pack inside its rated window.
What warranty and after-sales support apply in the Tunnels & Bridges scenario?
Standard products carry a full warranty backed by lifetime technical support, with terms confirmed on the quotation; export packing is UN 38.3-certified with MSDS. Tell us the number of lamps, the required duration and the installation environment — our engineers size the pack and recommend the matching model within 24 hours.
Need a Selection Recommendation?
Tell us the load, backup time and installation space — our engineers will recommend the matching battery within 24 hours.
NDA available upon request · Typical response within 12 hours