How to Calculate LED Strip Power Supply Size: Complete Calculator Guide
- 2026-09-09 15:28
- /
- Arraystar
Quick Answer
Calculate power supply size by multiplying the strip's wattage per meter by total length, then add 20% headroom. Formula: Power (W) = (W/m × meters) × 1.2. For example, 10m of 14.4W/m strip = 144W × 1.2 = 172.8W, so choose a 200W power supply. Always use a power supply rated for LED applications with appropriate voltage (12V/24V/48V).
Understanding LED Strip Power Consumption
LED strip power consumption is specified in watts per meter (W/m). Common values: 7.2W/m (60 LEDs/m, low brightness), 14.4W/m (120 LEDs/m, standard), 19.2W/m (240 LEDs/m, high brightness), 24W/m (high-power COB), 28.8W/m (ultra-high density). Always use the manufacturer's specified wattage, not estimates.
Step-by-Step Calculation
Step 1: Determine total strip length in meters. Step 2: Find the strip's wattage per meter from product specifications. Step 3: Multiply: Total Watts = W/m × meters. Step 4: Add 20% headroom: Required Power = Total Watts × 1.2. Step 5: Choose the next standard power supply size above your required power. Never run a power supply at 100% capacity—this shortens its lifespan.
Common Calculation Examples
| Factor | Option A | Option B |
|---|---|---|
| Brightness | Medium-High | High |
| Efficiency | Good | Excellent |
| Cost | Lower | Higher |
| Best For | General applications | Premium installations |
Power Supply Quality Matters
Not all power supplies are equal. Quality LED drivers feature: constant voltage output, low ripple (<5%), overvoltage/overcurrent/short-circuit protection, efficiency >85%, and appropriate safety certifications (CE, UL, FCC). Cheap unbranded power supplies may fail prematurely, cause LED flicker, or even create fire hazards. Always use power supplies from reputable manufacturers.
Multiple Strips and Power Injection
When using multiple strips or long runs, consider power distribution. For runs exceeding the maximum recommended length (5m for 12V, 10m for 24V), use power injection: connect power at both ends or at intermediate points to prevent voltage drop and color shift. Calculate total power for all strips combined, then size your power supply accordingly. You can use one large power supply or multiple smaller ones distributed along the installation.
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Frequently Asked Questions
Q: What should I consider before buying led cabinet sensor?
A: Key factors include: required brightness (lumens/m), color temperature, voltage (12V/24V/48V), IP rating for environment, LED density, CRI requirement, dimming compatibility, and total run length. Calculate total wattage to size your power supply correctly.
Q: How do I calculate the power supply size for led cabinet sensor?
A: Multiply the strip's wattage per meter by total length, then add 20% headroom. For example: 5m × 14.4W/m = 72W + 20% = 86.4W, so choose a 100W power supply. Always use a power supply rated for LED applications.
Q: What is the maximum run length for led cabinet sensor?
A: This depends on voltage and copper weight. 12V strips typically max 5m, 24V up to 10m, 48V up to 20m. For longer runs, use power injection at both ends or intermediate points to prevent voltage drop and color shift.
Q: Can led cabinet sensor be used outdoors?
A: Only IP65 or higher rated strips are suitable for outdoor use. IP65 for covered/splash areas, IP67 for exposed outdoor, IP68 for underwater/submersion. Always use waterproof connectors and properly seal all connections for outdoor installations.
Q: How do I dim led cabinet sensor?
A: Multiple dimming options available: 0-10V, PWM, TRIAC, DALI, DMX512, and wireless (WiFi/Zigbee/Bluetooth). Ensure your dimmer is compatible with the strip's voltage and current. COB strips dim especially smoothly due to uniform light output.
Conclusion
Calculate power supply size by multiplying the strip's wattage per meter by total length, then add 20% headroom. Formula: Power (W) = (W/m × meters) × 1.2. For example, 10m of 14.4W/m strip = 144W × 1.2 = 172.8W, so choose a 200W power supply. Always use a power supply rated for LED applications with appropriate voltage (12V/24V/48V). Arraystar LED offers 15+ years of LED strip manufacturing experience with full OEM/ODM capabilities, CE/RoHS/ERP certification, and 3-year warranty. Contact our team for a free consultation and custom quote for your project.
Ready to start your project? Contact us today for expert guidance and competitive pricing.
About the Manufacturer
ArrayStar LED is a professional LED strip manufacturer in Shenzhen, China since 2010, serving 80+ countries. We support custom OEM/ODM projects (custom CCT, CRI, PCB, logo, packaging) and wholesale supply for distributors and contractors worldwide.
