An LED power supply (also called an LED driver or LED transformer) converts your mains AC electricity into the DC power that LEDs need to operate.
Think of it like this: Your home runs on AC power, but LEDs need DC power. The power supply is the translator between them. Choose the wrong one, and your lights won't work - or worse, they'll be damaged.
📋 WHAT'S IN THIS GUIDE:
⚡ Choosing the Right Voltage (5V vs 12V vs 24V)
⚠️ CRITICAL: Your LEDs will be marked with their voltage (5V, 12V or 24V). Your power supply MUST match this exactly. A 24V supply will instantly destroy 12V LEDs!
When to use each voltage:
🔵 5V Power Supplies
Best for: Small, USB-powered projects
- TV backlighting (up to 2m)
- Display cabinet accents
- PC case lighting
- Battery-powered projects
Real Example: 2m LED strip behind a TV = 5V 30W power supply needed
🔵 12V Power Supplies (MOST COMMON)
Best for: Most home installations up to 5m
- Kitchen cabinet lighting
- Bedroom & living room strips
- Bathroom mirrors (with IP rating)
- Garden lighting (with weatherproofing)
Real Example: 5m kitchen cabinet strip = 12V LED driver at 60-100W needed
🔵 24V Power Supplies
Best for: Long runs over 5m & commercial projects
- Shop displays & retail lighting
- Office installations
- Architectural features
- Any run over 10m
Real Example: 10m retail display = 24V LED power supply at 150W+ needed
🔢 Calculating How Much Power You Need
Simple 4-Step Formula:
- Find your LED's watts per metre (it's on the product page)
- Multiply by your total length (in metres)
- Add 20% safety margin (multiply by 1.2)
- Round up to the next available size
📐 Real Calculation Example:
Your LED strip: 14.4W per metre
Your length: 5 metres
5m × 14.4W = 72W
72W × 1.2 (safety margin) = 86.4W
→ Choose a 100W power supply
❌ COMMON MISTAKE: Don't run a 60W supply for 60W of LEDs! It'll overheat and fail within months. Always add that 20% buffer.
🎛️ Making Your LEDs Dimmable
Not all dimmable power supplies work the same way. Choose based on what you already have (or plan to install):
TRIAC Dimmable
Works with: Standard wall dimmers
Best for: Home installations
- ✅ Uses existing dimmer switches
- ✅ Simple to install
- ✅ Affordable option
- ❌ Single zone only
DALI Dimmable
Works with: Digital control systems
Best for: Commercial buildings
- ✅ Control 64 zones individually
- ✅ Create lighting scenes
- ✅ 0.1% to 100% dimming
- ❌ Requires DALI controller
0-10V Dimmable
Works with: Low voltage controllers
Best for: Simple commercial
- ✅ Reliable & simple
- ✅ Works with sensors
- ✅ Good for retrofits
- ❌ Requires control wiring
💡 PRO TIP: Many of our power supplies accept ALL THREE dimming types (TRIAC, DALI, and 0-10V). Perfect if you're not sure what you'll use yet!
🔌 Plug-in vs Hardwired Power Supplies
Plug-in Power Supplies
Perfect when:
- ✅ No electrician needed
- ✅ Adding to furniture
- ✅ Temporary installation
- ✅ Under 100W total
Includes:
- 1.8m cable
- 2.1mm DC plug
- Safety protections
Hardwired Power Supplies
Best when:
- ✅ Permanent installation
- ✅ Over 100W needed
- ✅ Multiple LED runs
- ✅ Hidden installation
Options:
- IP20 (indoor)
- IP65 (bathroom/outdoor)
- IP67 (fully weatherproof)
⚡ Quick Power Supply Selector
Answer these 4 questions to find your perfect power supply:
30-Second Selector Tool
1️⃣ What's your LED voltage?
→ Check your LED product (5V / 12V / 24V)
2️⃣ How many watts do you need?
→ Length (m) × watts/m × 1.2 = _____W
3️⃣ Where's it being installed?
→ Indoor dry = IP20 | Bathroom = IP44 | Outdoor = IP65+
4️⃣ Need dimming?
→ No / Wall dimmer (TRIAC) / Smart system (DALI)
Common Setups - Quick Reference
| Project | Typical PSU Needed | Shop Link |
|---|---|---|
| 3m Kitchen Cabinets | 12V 60W Plug-in | View Options → |
| 5m Living Room | 12V 100W TRIAC Dimmable | View Options → |
| 10m Garden Path | 24V 150W IP67 | View Options → |
| Bathroom Mirror | 12V 30W IP44 | View Options → |
| Shop Display | 24V 200W DALI | View Options → |
❌ 5 Expensive Mistakes to Avoid
1. Wrong Voltage = Instant Death
24V power into 12V LEDs = immediate failure. No warranty covers this!
✅ Solution: Always triple-check voltage before connecting.
2. No Safety Margin = Early Failure
Running at 100% capacity overheats the PSU. Lifespan drops from 5 years to 6 months.
✅ Solution: Always add 20% headroom to your calculations.
3. Wrong IP Rating = Water Damage
Indoor PSU in bathroom = moisture failure within weeks.
✅ Solution: IP44+ for bathrooms, IP65+ for outdoors.
4. Incompatible Dimmer = Flickering
TRIAC dimmer with non-TRIAC PSU = flickering, buzzing, or no dimming.
✅ Solution: Match dimmer type to PSU type.
5. Voltage Drop on Long Runs
12V over 10m = dim LEDs at the end.
✅ Solution: Use 24V for runs over 5m, or add power injection points.
🔧 Professional Installation Tips
Installation Best Practices
📍 Location & Ventilation:
- Keep 10cm clearance around PSU for cooling
- Mount where accessible for maintenance
- Never bury in insulation
- Check ambient temperature rating
⚡ Wiring Safety:
- Use 1.5mm² cable minimum for long runs
- Keep AC and DC cables separated
- Add inline fuses for protection
- Label everything for future reference
📋 Planning Ahead:
- Zone circuits for easier control
- Include 30% spare capacity for additions
- Document your installation
- Keep spare fuses/connectors
✅ Ready to Choose Your Power Supply?
Browse Our Complete Range
Professional-grade LED power supplies with up to 7-year warranties
🤔 Still Not Sure?
Our technical team provides FREE consultation for any project
Email us: sales@weloveleds.co.uk
Include your project details and we'll recommend the perfect power supply within 24 hours
