LED Power Supplies for Sign Lighting Applications
Constant-voltage LED power supplies for channel letters, light boxes, cabinet signs, advertising displays and outdoor illuminated signage across North American and European installations. The current portfolio centers on 12V / 24V sign-lighting systems with UL Class 2 options, IP-rated protection, multi-channel distribution and TRIAC / ELV / MLV phase-cut dimming for 120V and 100–277V input applications. These products are also commonly referred to as constant voltage LED drivers.
Find the Right Power Supply for Your Sign Lighting Application
Use the sign type, voltage, output structure, dimming method and environment to narrow the priority power supply series before reviewing complete model tables on each series page.
Compact Channel Letters
Slim non-dimming 12V / 24V constant-voltage power for channel letters, cabinet lighting and restricted installation spaces. The L2-E series provides a compact aluminum housing ideal for narrow letter returns.
L2-E Compact Sign Power Supply Series →Large Light Boxes & Billboards
Multi-channel UL Class 2 constant-voltage architecture for divided circuits, large light boxes and billboard signage. The L2 series balances load across independent outputs for easier fault isolation.
L2 Multi-Channel Sign Power Supply Series →Dimmable Cabinet & Retail Signs
Enclosed UL Class 2 solution with TRIAC, ELV, MLV, 0–10V, PWM and potentiometer dimming options. The L2-A series is designed for retail signage and advertising displays requiring controlled dimming.
L2-A Dimmable Sign Power Supply Series →Outdoor / Wet-Location Signage
IP67 waterproof constant-voltage power for exposed façades, landscape-integrated signage and wet-location installations. The L2-F series combines waterproof protection with dimming compatibility.
L2-F Waterproof Sign Power Supply Series →North American Phase-Cut Signs
120Vac UL Class 2 constant-voltage solution for 12V / 24V signs requiring TRIAC, ELV or MLV dimming. The L2D series is purpose-built for North American phase-cut dimmer compatibility.
L2D Phase-Cut Sign Power Supply Series →High-Power / High-Current Signage
Isolated single-channel constant-voltage platform for high-load signage where 12V, 24V, 36V or 48V output is required. The L3 series covers power levels up to 1200W for large illuminated signs.
L3 High-Power Sign Power Supply Series →Common Power Challenges in Sign Lighting
Power architecture directly affects brightness consistency, reliability, installation and maintenance cost.
Uneven Brightness
Poor power distribution can create visible illumination differences across a sign.
View L2 Multi-Channel Sign Power Supply Series →Voltage Drop
Long cable runs and undersized conductors reduce voltage at distant LED modules.
Calculate your voltage drop →Limited Installation Space
Narrow channel letters and cabinets require a compact, thermally stable power supply.
View L2-E Compact Sign Power Supply Series →Outdoor Exposure
Rain, condensation, humidity and dust require a suitable enclosure and IP rating.
View L2-F Waterproof Sign Power Supply Series →Difficult Maintenance
Poorly divided circuits make fault isolation and future service more expensive.
See Class 2 multi-channel architecture →Recommended Power Supplies for Sign Lighting
Six priority constant-voltage power supply series cover multi-channel signage, compact installations, enclosed dimming, wet locations, phase-cut control and high-power sign-lighting applications. Full model tables and specifications are available on each series page.
L2 Multi-Channel Class 2 Sign Power Supply
Primary choice for large light boxes, billboards and signs that benefit from divided constant-voltage output channels. UL Class 2 architecture with independent circuits for balanced distribution and easier fault isolation.
- 12V / 24V · 60–400W
- 1–5 output channels
- TRIAC / ELV / MLV / 0–10V / PWM options
L2-E Slim Non-Dimming Sign Power Supply
Compact non-dimming solution for channel letters, LED signage and cabinet lighting with limited installation space. Slim aluminum housing fits narrow letter returns.
- 12V / 24V · 20–150W
- Non-dimmable · Slim housing
- IP65 / IP67 optional
L2-A Enclosed Dimmable Sign Power Supply
For signage, advertising and LED strip projects that require a protected enclosure and broad dimming compatibility including TRIAC, ELV, MLV, 0–10V and PWM.
- 12V / 24V · 30–400W
- UL Class 2 enclosed power supply
- TRIAC / ELV / MLV / 0–10V / PWM
L2-F IP67 Waterproof Sign Power Supply
For outdoor signs, branded façades and wet-location projects that require phase-cut or low-voltage dimming combined with waterproof protection.
- 12V / 24V · 60–400W
- IP67 waterproof design
- TRIAC / ELV / MLV / 0–10V / PWM
L2D 120V Phase-Cut Sign Power Supply
North American constant-voltage solution for advertising light boxes, LED strip and signage requiring 120V phase-cut dimming. UL Class 2 architecture in a metal enclosure.
- 120Vac input · 60W / 100W
- UL Class 2 architecture
- TRIAC / ELV / MLV dimming
L3 High-Power Constant-Voltage Sign Power Supply
Isolated single-channel platform for high-current signage, advertising and LED strip projects requiring higher constant-voltage power up to 1200W. IP67 / IP68 rated for demanding environments.
- 12V / 24V / 36V / 48V · 100–1200W
- IP67 / IP68 protection
- Non-dimmable · Isolated design
How to Select a Power Supply for LED Signs
Use a repeatable engineering sequence before choosing a product series or model.
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1
Confirm Output Voltage
Verify whether the LED modules operate at 12V or 24V DC.
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2
Calculate Total LED Load
Multiply module quantity by rated watts per module.
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3
Check the Environment
Identify indoor, damp or outdoor installation conditions.
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4
Divide Output Channels
Balance large signs across suitable output circuits.
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5
Confirm Dimming
Match the power supply to the required control protocol.
Sign Lighting Power Supply Sizing Calculator
Calculate total LED load, minimum power supply rating, DC current, per-channel load and estimated cable voltage drop. Then review the matching series pages for model selection.
Sign Lighting Power Supply Architecture
A multi-channel constant-voltage architecture can simplify distribution and help balance large illuminated signs.
Why Choose Fahold Power Supplies for Sign Lighting
Application-specific power supply engineering for channel letters, light boxes, cabinet signs and illuminated signage.
UL Class 2 Power Solutions
Suitable product configurations for projects requiring limited-power output circuits compliant with UL Class 2 requirements.
Multi-Channel Output
Independent outputs support better distribution across large signs and sections.
Slim Power Supply Housing
Compact aluminum enclosures fit restricted sign and light-box installation spaces.
Waterproof Protection
IP-rated options for damp locations, outdoor cabinets and exposed sign projects.
Dimming Compatibility
TRIAC, ELV, MLV, 0–10V and PWM control options for retail, architectural and branded signage.
OEM / ODM Development
Project support for output, housing, cable, connector, label and certification needs.
Custom Sign Lighting Power Supply Solutions
Different sign structures require different power distribution, wiring and control. Fahold can evaluate project-specific constant-voltage LED power supply configurations for signage manufacturers, lighting brands and engineering contractors, including products also specified as constant-voltage LED drivers.
Find the Right LED Power Supply for Your Project
Share the core electrical and application requirements. We will narrow the available FAHOLD platforms to the options most relevant to your project.
Frequently Asked Questions
Core questions buyers and engineers should confirm before selecting a sign-lighting power supply.
What type of power supply is used for sign lighting?
Most LED modules and LED strips used in illuminated signs require a constant-voltage LED power supply. The same product category is also commonly called a constant-voltage LED driver. The output voltage must match the LED load, commonly 12V or 24V DC. For compact channel letters, the L2-E slim series is a common choice; for larger signs, see the L2 multi-channel series.
Should I choose a 12V or 24V LED sign power supply?
Use the voltage specified by the LED module manufacturer. A 24V system normally carries half the current of a 12V system at the same wattage, which can reduce cable voltage drop, but the LED load and power supply voltage must match. Both 12V and 24V options are available across the L2, L2-A, L2-F and L3 series.
How do I calculate the required sign power supply wattage?
Multiply the number of LED modules by the rated watts per module to obtain total LED load. Divide that load by the chosen maximum power supply utilization. For example, 120W of LED load at 80% utilization requires a power supply rated for at least 150W. Use the sign lighting power supply calculator above for a detailed estimate.
Why are multiple output channels useful?
Multiple channels divide a large sign into separate output circuits. This can simplify wiring, balance current distribution and make troubleshooting easier. The L2 multi-channel series offers 1–5 independent Class 2 outputs.
Does an outdoor LED sign require an IP67 power supply?
The required protection depends on the actual installation location and enclosure. Outdoor or wet-location projects commonly require an appropriately IP-rated power supply. The L2-F IP67 waterproof series and the L3 high-power series (IP67/IP68) are designed for these conditions.
Can sign-lighting LED power supplies be dimmed?
Yes, when the selected series and control system use compatible dimming methods. TRIAC / ELV / MLV dimming is available in the L2-A enclosed series, L2-F waterproof series and L2D 120V phase-cut series. 0–10V and PWM options are also supported. The L2-E and L3 series are non-dimmable.
How can I reduce voltage drop in a large sign?
Use a larger conductor, shorten the cable run, increase the number of balanced output channels, move the power supply closer to the LED load or evaluate a suitable 24V LED system. The cable voltage drop calculator above can help you estimate the impact of different conductor sizes.
Can Fahold customize cables, connectors and output channels?
Project-specific configurations can be evaluated based on output voltage, rated power, channel quantity, dimming, cable, connector, housing, labeling, packaging and certification requirements. Contact our team with your project details.
Browse Power Supply Series for Sign Lighting
Each series page includes complete model tables, specifications, dimming options, certifications and datasheet downloads.
Get a Sign Lighting Power Supply Recommendation
Share your LED voltage, total load, environment and control requirements. The calculator result can be transferred automatically into the inquiry form below.
