Corridor Mode is an intelligent, energy-saving feature integrated into LED drivers. It is specifically designed for areas requiring 24/7 low-level ambient lighting that are frequently left unoccupied, such as corridors, stairwells, underground parking garages, and warehouses.

Simply put, it acts as a "breathing" energy-saving assistant: it maintains a dim standby glow when the area is empty and automatically ramps up to full brightness when motion is detected.

Below is a detailed breakdown of its working principle, core features, and application benefits:

1. How Does It Work? (Core Mechanism)

Corridor Mode typically operates in tandem with an external motion sensor (such as a microwave or PIR sensor). The brightness profile generally consists of three distinct phases:

Unoccupied State (Standby / Background Level): When no presence is detected, the luminaire does not turn off completely. Instead, it remains at a pre-defined low light level (typically 10% or 20%). This provides essential safety lighting while significantly reducing power consumption.

Occupied State (Full Output): As soon as the sensor detects a person or vehicle entering the zone, the LED driver swiftly (or smoothly) ramps up the light output to 100%.

Switch-off Delay (Fade-down Recovery): Once the area is vacated and the sensor's preset hold time (e.g., 1 minute) elapses, the driver does not abruptly cut the light. Instead, it smoothly fades down back to the initial 10% or 20% standby level.

2. Core Features & Technical Highlights

1/0V or DALI Signal Control: The driver features built-in control algorithms. The motion sensor only needs to output a standard mains voltage switch signal (230V ON/OFF) to the control input. The driver automatically recognizes this signal and toggles between "Full Output" and "Standby Level," eliminating the need for complex central management systems.

Soft On / Soft Off (Smooth Dimming): The transition between light levels is seamless rather than abrupt. A smooth dimming profile (e.g., a 1–2 second fade-in and a multi-second fade-out) enhances visual comfort and prolongs the operational lifespan of both the LED module and the driver by avoiding current spikes.

Configurable Parameters (Available in High-End Drivers):

Standby Dim Level: Can be customized to 10%, 20%, or 30% depending on project requirements.

Fade Time: The duration it takes for the light to transition from 100% down to the standby level.                                               3. Typical Applications

This mode is ideal for public and commercial spaces that "must never go completely dark, yet remain vacant most of the time":

Emergency Stairwells in High-Rise Buildings (Meets code-required baseline illumination while maximizing energy savings).

Public Corridors and Hallways in hotels, hospitals, and office buildings.

24-Hour Underground Parking Garages.

Aisle Lighting in large-scale logistics centers and warehouses.

While "EL" can occasionally stand for Electronic Control Gear in certain contexts (as a marking compliant with European and international standards for driver identification), when referring to a specific function, it almost exclusively denotes emergency lighting control and switching.

Here is the professional English translation detailing the core concepts, working principles, and application scenarios of the EL (Emergency Lighting) function in LED drivers:

The EL (Emergency Lighting) Function in LED Drivers

1. What is the EL (Emergency Lighting) Function in LED Drivers?

An LED driver with the EL function (commonly known as an Emergency LED Driver or Emergency Inverter) is an intelligent control device. Under normal grid conditions, it operates as a standard LED driver. However, during a mains power failure (or in emergencies such as a fire), it automatically switches to a backup power source (typically a battery pack) to maintain illumination.

Core Purpose: To ensure that escape routes, emergency exits, and critical areas within a building remain sufficiently illuminated during grid failure or catastrophic events, thereby guaranteeing safe personnel evacuation.

2. Core Working Principles of the EL Function

The EL function relies on the synergy between the LED driver, a backup battery pack, and an emergency detection circuit:

🔄 Mode 1: Normal Operation (Mains Mode)

Illumination Status: The driver is powered by the standard AC mains supply, illuminating the LED luminaire according to standard user inputs (such as wall switches or dimming controls).

Battery Management: The integrated charging module within the driver intelligently charges the backup battery pack, transitioning to trickle charge once fully charged to prolong battery lifespan.

🚨 Mode 2: Emergency Operation (Mains Failure Mode)

Automatic Detection: The internal grid-monitoring circuit detects when the mains voltage drops below a predefined threshold (or fails completely), responding swiftly within 0.1 to 0.5 seconds.

Power Source Switching: High-speed internal relays or electronic switches instantly isolate the mains circuit and transfer the load to the backup battery pack.

Emergency Lumen Output / Reduced Power Operation: To extend the duration of emergency illumination, most EL drivers operate in a low-power mode during an emergency (typically running at 10% to 30% of full rated power). This ensures compliance with regulatory emergency duration requirements (typically a minimum of 90 or 180 minutes).

3. Key Technical Features of EL Drivers

High-quality EL LED drivers generally incorporate the following advanced features:

Self-Test / Auto-Test Function: To comply with fire safety regulations, emergency luminaires must undergo periodic inspections. Smart EL drivers automatically execute scheduled monthly tests (simulating a brief mains failure to check the battery and light source status) and annual tests (full discharge tests to verify battery capacity). System statuses or faults are communicated via multi-colored LED indicators (Red/Green/Yellow).

Centralized Control Interfaces (e.g., DALI-2 Emergency): In large-scale commercial buildings, EL drivers often integrate the DALI (Digital Addressable Lighting Interface) protocol. A centralized emergency lighting management system can monitor battery health, luminaire status, and trigger remote emergency tests in real time via the DALI bus.

Deep Discharge Protection (DDP): When the backup battery discharges to its critical voltage threshold, the driver automatically cuts off the output to prevent permanent cell damage caused by over-discharging.

In the LED lighting industry, CLO stands for Constant Light Output. It is a highly practical and energy-efficient core feature integrated into modern intelligent LED drivers.

Simply put, the CLO function acts as a "temporal compensator" for LED fixtures, specifically designed to counteract the lumen depreciation (light decay) that naturally occurs over time.

1. Why is CLO Needed? (Background)

All LED light sources share a common physical characteristic: their luminous efficacy gradually decreases over time, a phenomenon known as lumen depreciation or light decay.

The Drawback of Traditional Design (Over-design): To ensure a fixture still meets the required design illumination at the end of its lifespan (e.g., after 50,000 hours of operation), engineers traditionally over-design the initial output. For instance, if a space only requires 1,000 lumens, the fixture might be configured to output 1,200 lumens initially.

The Resulting Issues:

1 Energy Waste: During the first few years of operation, users pay for excess electricity to generate higher-than-necessary brightness.

2 Accelerated Aging: The higher initial operating current generates more heat, which conversely accelerates the degradation of the LED chips.

2. How CLO Works

The CLO function addresses these challenges flawlessly by dynamically adjusting the driving current.

Integrated Odometer/Timer: The LED driver features a built-in timer that tracks and accumulates the fixture's actual operating hours.

Preset Lumen Maintenance Curve: Manufacturers program a pre-defined compensation curve into the driver’s Microcontroller Unit (MCU), based on the specific lumen maintenance characteristics of the LED chips (e.g., the L_{80}B_{10} metrics).

Dynamic Current Compensation:

Initial Stage (New Fixture): The driver operates at a lower output current, delivering exactly the designed brightness. Since it does not run at full load, it saves significant energy.

In-Service Stage: As the cumulative operating time increases, the driver automatically and gradually ramps up the output current according to the preset curve.

Late Stage: The increased current precisely offsets the LED's lumen depreciation, ensuring the total luminous flux (brightness) remains completely constant throughout the fixture's entire lifespan.

3. Typical Application Scenarios

The CLO function is ideal for environments with long maintenance cycles, strict illuminance requirements, or large-scale lighting installations:

Roadway and Tunnel Lighting: Streetlights consume high power and are deployed in massive quantities. CLO delivers phenomenal energy savings here while guaranteeing long-term roadway safety illuminance.

Industrial Facilities and Warehouses: Due to high installation heights, replacing these fixtures is labor-intensive. CLO effectively extends maintenance intervals and reduces frequency.

Office and Commercial Lighting: It maintains a stable and comfortable luminous environment, thereby enhancing workplace productivity.

New! LUXEON 2835N 

Lumileds added LUXEON 2835N, an important 3V proliferation, to the LUXEON 2835 Line.

These new LEDs are available across the entire CCT range from 1800K to 6500K and with

minimum CRIs of 80 and 90. Please visit the Lumileds updated web page where, in addition

to the new datasheet and product brief, you’ll see that they’ve split the product table into

three sections, one each for 3V, 6V, and 9V.

Dear Customer:

CNY holidays:  24-Jan to 31-Jan. 

We will resume on 1st-Feb.

ZHONGSHAN UNILED PROFESSIONAL LIGHTING CO.,LTD will participate in the 24th Guangzhou International Lighting Exhibition.

Time: June 9-12, 2020

Venue: Guangzhou China Import and Export Fair Complex

Booth No: 8.1 Pavilion J26

Welcome customers!

Current by GE Release LED Replacement of High Power Grow Light; LED by Fluence by Osram Proved more Effective in Green House.

Horticultural applications of LED lighting are the current trend in the lighting industry. Leading companies around the world have been developing different products to meet the increasing demands.

As worldwide need for healthy, fresh food continues to grow, greenhouse growers require efficient, effective lighting to enable year-round growing. Current, powered by GE announced the release of the Arize Element Top Light, the industry’s first one-for-one LED replacement for 1000W High Pressure Sodium (HPS) products.

The Arize Element features multiple light spectrums to maximize growth for specific crops, allowing growers to tailor the light to the specific needs of each crop. Universal installation options allow the light to be installed in dozens of different ways on existing structures, dramatically reducing installation time. The light also features a unique design that minimizes shadowing, allowing for maximum natural light penetration.

Osram Opto Semiconductors presents P2W 01, a particularly reliable addition to its familiar Osram Ostar Projection series. This new LED contains four chips which can be controlled in two separate groups. The LED therefore represents an integrated solution which in the event of emergencies offers trouble-free operation in safety-related and security-related applications such as control room monitors.

 “The redundant system of the new Osram Ostar Projection is ideal for 24/7 applications. If a chip should ever unexpectedly fail, the second system will continue to operate without any problem at all”, said Wolfgang Schnabel, Product Marketing LED at Osram Opto Semiconductors. Up to now, only the chips in the large Osram Ostar Projection P3W could be controlled separately. This is now also possible with the P2W 01. Osram Opto Semiconductors has developed a compact LED with two self-contained parallel systems with two chips each. The connection design has also been improved, from 2-pad to 3‑pad. This means there are now three connections instead of two. All four chips occupy one pad, the other two pads are each reserved for a group of two. “A new soldering process ensures that the heat produced in the application remains low. The connection between the chip and the package can therefore withstand a lot”, added Schnabel.

UPL successfully supported one of our client on the professional project for Asian Games in August-2018 in Indonesia. UPL has a great appreciated from this customer.