LED Modules – 12V IP67 Injection Modules for Signs
1.5W Green LED Module 12V High Intensity IP67 Waterproof ~5245
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From £2.19 GBP
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12V RGB LED Module Lights IP67 Waterproof | Low Voltage Injection Strip ~5246
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From £2.99 GBP
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Industrial 12V IP67 Waterproof Warm White Injection LED Modules ~ 5677
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From £0.35 GBP
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Led COB Module IP67 DC 12V Sign Strip ~2855
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From £1.95 GBP
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£2.34 GBP
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Blue LED Module 12V IP67 Waterproof 1.5W Sign Backlight~5240
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From £0.19 GBP
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How to Choose LED Modules for Shop Signs and Lightboxes (UK Guide)
LED modules are small, sealed LED lights that you chain together inside shop signs, channel letters, lightboxes and backlit displays. Most modules carry three SMD LEDs under a protective lens, and the modules are joined by a short cable, so you can lay out an even, bright grid of light in almost any sign.
The 12V range below uses 1.5W modules with a 160°+ beam angle and an IP67 waterproof rating, in cool white, warm white, green, blue and RGB, plus COB, decorative and mains-voltage backlight sets. Free UK delivery on orders over £30.
12V DCstandard module voltage
1.5Wper 12V module
120 lmper module
160°+wide beam angle
IP67on the 12V single-colour range
Quick answer: which LED module should I buy for a sign?
- Best all-rounder: the Cool White 12V IP67 module for crisp, modern lightboxes and signs.
- Softer, warmer glow: the Warm White 12V IP67 module.
- Brand colours: green, blue or RGB modules.
- Even line of light in strip signs: the COB sign strip module.
- Power: every 12V module needs a 12V DC constant voltage driver. See choosing a power supply.
Shop LED modules for signs and lightboxes
Every module in this collection is made for sign work: low profile, double-sided adhesive backing on most, and a wide beam so a small number of modules covers a large lit area. Pick your colour, choose a pack size (most come as 1, 10, 20 or 100), and pair it with a driver that matches the total wattage.
All-rounder
Cool White IP67 12V LED Module Injection with Tape ~5244
- 12V DC
- 1.5W
- 120 lm
- IP67
- 160°+ beam
Crisp white light for lightboxes, shop fascias and channel letters. Self-adhesive fixing.
Shop cool white
Industrial 12V IP67 Waterproof Warm White Injection LED Modules ~5677
- 12V DC
- 1.5W
- 120 lm
- IP67
- 70 × 15 mm
A softer, warmer glow for cafés, boutiques and hospitality signage. Packs of 1 to 100.
Shop warm white
1.5W Green LED Module 12V High Intensity IP67 Waterproof ~5245
- 12V DC
- 1.5W
- 120 lm
- IP67
- CE & RoHS
Bright green for pharmacy crosses, brand lettering and accent lighting.
Shop green
Colour changing
12V RGB LED Module Lights IP67 Waterproof | Low Voltage Injection Strip ~5246
- 12V DC
- 1.5W
- RGB
- 160°+ beam
Full-colour modules for displays and signs that change colour. Check the product page for control options.
Shop RGB
Blue LED Module 12V IP67 Waterproof 1.5W Sign Backlight ~5240
- 12V DC
- 1.5W
- 150 lm
- IP67
Deep blue sign backlight in packs of 1, 10, 20 or 100 for lettering and feature lighting.
Shop blue
Led COB Module IP67 DC 12V Sign Strip ~2855
- 12V DC
- 2W
- 120 lm
- 70 × 19 × 5 mm
- Aluminium PCB
COB chips give a smoother, more continuous line of light in narrow sign strips.
Shop COB
200 module set
Decorative LED Sign Lighting Module ~6839
- 12V DC
- 1.5W
- 3 LEDs
- 200 modules
A large 200-module set for big signs, in green, yellow, cool white, warm white or RGB.
Shop the set
Mains voltage
Waterproof LED Sign Backlight Modules ~6838
- AC 220V
- 2W
- IP65
- 20 to 200 pcs
A mains-voltage set in warm white, cool white, yellow or green. Not for use on a 12V driver.
Shop backlight sets
Check the voltage before you buy. Most modules on this page run on 12V DC and need a 12V driver. The Waterproof LED Sign Backlight Modules (~6838) are listed as AC 220V, so they must never be connected to a 12V power supply. Each product page shows the voltage and IP rating, and we are happy to check your set-up if you contact us.
What is an LED module, and how does it work?
An LED module, also called an LED injection module, is a small circuit board carrying a few LEDs, sealed inside a moulded shell. The standard modules in this range carry three SMD LEDs and draw 1.5W at 12V DC. They are wired in a chain, so one cable feeds the next module along, and the whole run connects to a single 12V driver.
Because each module throws light over a wide angle, 160° or more, you do not need to space them close together. Place them inside a lightbox or letter, put a diffuser or acrylic face over the top, and the individual points of light blend into an even glow. That is why modules are the standard choice for shop fascias, lightboxes, illuminated lettering, double-sided signs and advertising displays.
What are LED modules used for?
- Shop signs and fascias: backlighting a printed face or acrylic panel.
- Channel letters and 3D lettering: a short chain per letter gives even fill.
- Lightboxes and menu boards: bright, even light behind graphics.
- Display backlighting: retail fixtures, trade-show stands and showcases.
- Accent and decorative lighting: coloured modules for features, logos and hospitality signage.
How to choose LED modules: a buying guide
1. Pick the colour
Cool white gives a crisp, modern look and suits most lightboxes. Warm white is softer and works well for cafés, restaurants and boutiques. Green, blue and RGB suit brand colours and feature lighting. Match the module colour to your face material: a pale, thin acrylic shows more colour shift than a dense opal one, so test a short run before committing to a large order.
2. Match the module to the sign
For standard lightboxes and letters, the 1.5W injection modules are the easiest choice. For narrow sign strips where you want a smooth, continuous look, choose the COB module. For very large signs, the 200-module decorative set works out more economical than buying small packs.
3. Think about where it will live
The single-colour 12V modules are IP67 rated, which means they are protected against dust and temporary immersion in water, so they suit outdoor and damp locations. Always seal cable joints, and keep the driver dry. If the sign is indoors only, an IP20 power supply is fine. Outdoors, choose an IP67 waterproof LED driver or an IP45 rainproof driver inside a sheltered enclosure.
4. Choose a pack size
Most 12V modules are sold as 1, 10, 20 or 100, and the cost per module falls as the pack gets bigger. Measure the sign, lay a few modules out dry, work out the total you need and add a few spares. Buying everything in one batch also keeps colour consistent across the sign.
5. Plan the electrics early
Decide your total wattage before you buy the driver, not after. The next section shows how.
Choosing the right power supply for 12V LED modules
All the 12V modules need a 12V DC constant voltage driver. Do not use a constant current driver, and never connect 12V modules straight to the mains. Browse our DC 12V transformers, constant voltage transformers, LED transformers or the full transformer range.
How to size your driver
- Count your modules and multiply by 1.5W (2W for COB modules).
- Add 20% headroom so the driver is never running flat out.
- Choose a 12V driver with at least that wattage.
| Modules | Load at 1.5W each | Add 20% headroom | Choose a driver of at least |
|---|---|---|---|
| 20 | 30W | 36W | 36W (a 40W driver is a common size) |
| 50 | 75W | 90W | 90W (a 100W driver is a common size) |
| 100 | 150W | 180W | 180W (a 200W driver is a common size) |
| 200 | 300W | 360W | 360W (use two drivers or a larger unit) |
For long runs, split the sign into several shorter chains, each fed from the driver, rather than one very long line. This avoids voltage drop and keeps brightness even. Need more help? Read our guide on how to choose the best LED driver for LED modules.
Dimming and colour control: a standard transformer will not dim your modules. To dim, use a dimmable 12V driver or a compatible LED dimmer. RGB modules are normally run from an RGB controller as well as a driver.
LED modules vs other sign lighting
Modules are not the only way to light a sign. This table shows where each option fits.
| Option | Best for | Look | Consider |
|---|---|---|---|
| LED modules | Lightboxes, channel letters, deep signs | Even backlight from points of light | Needs enough depth behind the face |
| Neon flex | Visible neon-style lettering and shapes | Continuous glowing line | Light is seen directly, not hidden |
| LED panels | Slim backlit displays and ceiling use | Flat, uniform surface of light | Larger and heavier than modules |
In short, choose LED modules when the light source sits behind a face and should not be seen, and choose neon flex when the glowing line is itself the design.
How to install LED modules in a sign
- Plan the layout. Lay the modules out dry in an even grid and check the spacing against the depth of the sign.
- Switch off and isolate the power. Do not connect or change wiring while the driver is live.
- Clean the surface. Dust and grease stop the adhesive backing from holding.
- Fix the modules. Peel the backing and press each module down firmly.
- Join the chain. Connect the cables in order, keeping each run short.
- Wire to the driver. Connect positive (+) to positive and negative (−) to negative.
- Test before you close up. Power on, check every module lights, then seal the sign.
The 12V side is low voltage, but the driver connects to 230V mains, so use a qualified electrician for the mains connection and follow UK wiring regulations. Useful extras are in our wire connectors and junction boxes and accessories.
LED module troubleshooting: why isn't my sign working?
| Problem | Likely cause | Fix |
|---|---|---|
| Nothing lights up | Reversed polarity, wrong driver or loose connection | Check + and − are the right way round, confirm the driver outputs 12V DC, and re-seat the connectors. |
| Last modules are dimmer | Voltage drop on a long run | Split into shorter chains, each fed from the driver, or use thicker cable. |
| Flickering | Overloaded driver, poor connection or incompatible dimmer | Add 20% headroom, check joints, and use a dimmable 12V driver. |
| One section is out | Damaged cable or loose joint in the chain | Check the first dark module's connection and replace the damaged section. |
| Driver cuts out or runs hot | Overload or poor ventilation | Use a larger driver and allow airflow around it. |
| Moisture in the sign | Unsealed cable joints | Dry out, then seal every joint and keep the driver dry. |
LED module FAQs
What is an LED module?
An LED module is a small sealed circuit board with a few LEDs under a moulded lens. Modules are joined by cable in a chain and fixed inside signs, channel letters and lightboxes to light them evenly from behind.
What are LED injection modules used for?
They are used to backlight shop signs, fascias, channel letters, lightboxes, menu boards and retail displays. Their wide beam angle lets a small number of modules light a large area evenly.
What is the best LED module for signs in the UK?
For most lightboxes and shop signs, a 12V IP67 cool white injection module is the best all-rounder. Choose warm white for a softer look, COB for a smoother line of light in narrow strips, and green, blue or RGB for colour.
What power supply do I need for 12V LED modules?
A 12V DC constant voltage LED driver. Do not connect the modules directly to mains, and do not use a constant current driver. Add up the module wattage, add 20% headroom and choose a driver at or above that figure.
How many LED modules can I connect to one transformer?
Take the driver's wattage, remove 20% headroom, and divide by the wattage of one module. For example, a 100W driver with 20% headroom supports about 80W of load, or around 53 modules at 1.5W each. Check each product page for the maximum run length.
Can LED modules be used outdoors?
Yes. The 12V single-colour modules are IP67, which means protected against dust and temporary immersion in water. Seal the cable joints, and use an IP67 waterproof driver or mount the driver in a dry, ventilated enclosure. An IP20 power supply is for dry indoor use only.
Can I dim 12V LED modules?
Only with a dimmable 12V driver or a compatible LED dimmer or controller. A standard non-dimmable transformer will not dim them. RGB modules need an RGB controller as well as the power supply.
Why are the last modules in my run dimmer than the first?
This is voltage drop, caused by long cable runs or too many modules on one line. Keep runs short, use thicker cable, or split the sign into smaller runs, each fed from the transformer.
Does polarity matter when connecting LED modules?
Yes. LEDs only work one way round: connect positive (+) to positive and negative (−) to negative. If the modules do not light, check the polarity first.
Do I need an electrician to install LED modules?
The 12V module side is low voltage, but the transformer connects to 230V mains. We recommend a qualified electrician for the mains connection, in line with UK wiring regulations.
What is the difference between cool white and warm white LED modules?
Cool white is a crisp, bluish-white light that suits modern lightboxes and signs. Warm white is a softer, yellower light that suits cafés, restaurants and boutiques. Cool white is typically around 6000K and warm white around 3000K.
How much do LED modules cost, and is it cheaper to buy in bulk?
The price depends on the colour and type, but most 12V modules here are sold singly or in packs of 10, 20 or 100, and the cost per module falls as the pack size rises. Current prices are on each product page, and free UK delivery applies on orders over £30.
What is the difference between LED modules and neon flex?
LED modules sit hidden behind a face and light it from behind. Neon flex is a continuous glowing line that you see directly, so it suits neon-style lettering and shapes.
Need help choosing LED modules or a driver?
Tell us your sign size, colour and where it will be installed, and we will help you pick the right modules and a matching power supply. Call 02477 220687 or email sales@ledsone.co.uk.