MEAN WELL
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LED Sign Power Supplies for Channel Letters, Light Boxes and Displays
MEAN WELL power supplies for LED channel letters, light boxes, LED modules and display screens: IP67 potted 12V and 24V units for outdoor letters, enclosed 5V supplies for displays, and dimmable models for night-time dimming.
- 12V modulesThe common voltage for sign LED modules
- IP67 optionsPotted supplies for channel letters and outdoor signs
- 5V displaysEnclosed supplies for LED display screens
Step 1
Choosing a sign power supply
Most sign LED modules run on 12V DC. Multiply the watts per module by the number of modules on one supply, then divide by 0.8 so the supply runs at about 80% load (about 20% margin).
Many sign codes and inspectors ask for a Class 2 power unit, which limits output energy. On this page, the LPV-20, LPV-35 and LPV-60 datasheets list them as Class 2 power units; the LPV-100 datasheet does not, so check the datasheet when Class 2 is required.
Total load (W) = watts per module × number of modules
Minimum supply (W) = total load ÷ 0.8
Class 2: confirm on the model datasheet
Outdoor
IP67 potted supplies for channel letters (LPV, APV, ELG, HLG)
Fully encapsulated LPV supplies fit inside letter cans and raceways. ELG and HLG metal-housing drivers handle larger signs; their rating is IP65 or IP67 depending on the type, so check the product page.
View all LPV models →View all APV models →View all ELG models →View all HLG models →
Cabinets
Enclosed supplies for sign cabinets
Light boxes and sign cabinets often have room for an enclosed supply mounted inside the cabinet, away from direct water. The ERP series is an enclosed MEAN WELL option available by quote; confirm its environmental rating on the datasheet.
Mount enclosed supplies in the orientation shown in the datasheet and keep them out of standing water; the datasheet derating curve depends on mounting and temperature.
5V
Moving signs and LED displays
LED display screens and moving message signs usually run on 5V at high current. Enclosed LRS and RSP 5V supplies are common choices; MEAN WELL also has a dedicated Moving Sign series.
View all Moving Sign models →View all LRS models →View all NSP models →
Dimming
Dimmable signs and night-time dimming (PWM, HLG-B)
To dim a sign at night, use a dimmable driver and a controller or timer. The PWM series is a constant voltage driver with PWM-style output controlled by 0-10V, PWM signal or resistance. HLG and ELG AB-types offer 3-in-1 dimming; B-types are available by quote.
Service
Replacing a failed sign transformer
1
Check the output
Read the label: LED signs use a 12V or 24V DC supply. Neon uses a high-voltage transformer, which is not interchangeable with an LED supply.
2
Match load and rating
Add up the modules on that circuit, divide by 0.8, and match the IP rating (IP67 inside letters, enclosed in dry cabinets).
3
Wire and test
Follow the wiring diagram in the datasheet, keep the same polarity and confirm the voltage at the far end of the run.
Related resources
LED driversThe full MEAN WELL LED driver range.→Power supplies for LED strip lights12V and 24V LED tape, sizing and dimming.→Moving Sign seriesSupplies for moving message signs.→HLG seriesHigh-power outdoor drivers.→PWM seriesDimmable constant voltage drivers.→Enclosed power suppliesLRS, RSP and more for cabinets.→Find your MEAN WELL power supplySearch by voltage, wattage and type.→Request a quoteSign shop and project quantities.→
LED sign power supply FAQs
What power supply do I need for LED channel letters?
A 12V DC supply sized at the total module watts ÷ 0.8, usually an IP67 potted unit such as the LPV series inside the letter or raceway. Larger signs can use ELG or HLG drivers.
Does a sign power supply need to be UL Class 2?
It depends on the local code and the sign listing. Class 2 limits output energy and is often requested for signs. On this page, the LPV-20, LPV-35 and LPV-60 datasheets list them as Class 2 power units; check the datasheet of any other model.
IP67 vs rain-proof: which for an outdoor sign cabinet?
IP67 potted supplies can go inside letters and exposed locations. An enclosed supply can work inside a closed, dry sign cabinet. When in doubt outdoors, choose IP67.
How many LED modules can one power supply drive?
Divide the supply rating × 0.8 by the watts per module. Example: a 60W supply × 0.8 = 48 W, so about 60 modules at 0.8 W each. Also respect the module maker's maximum string length.
Can I replace a neon transformer with an LED power supply?
Only if you also replace the neon tubes with LED modules. A neon transformer outputs high voltage AC, while LED modules need a low-voltage DC supply.
What 5V power supply is used for LED display screens?
Enclosed 5V supplies with high current, such as the LRS-200-5, LRS-350-5 or RSP-320-5 (60 A). Size them for the panel maximum brightness current plus margin.
Need help choosing?
Send the module model, quantity and sign layout to sales@htdelectronics.com, or request a quote for sign shop quantities.