Constant Power Supply — Engineered for High-Demand LED Applications

Stable, efficient power delivery for industrial lighting, track systems, and horticultural grow setups. Sanpu constant power LED drivers are designed to outperform constant voltage in demanding environments.

40W – 400W Range

0-10V / DALI / TRIAC

UL / CE / ENEC Certified

IP20 / IP67 Rated

How It Works

Unlike constant voltage drivers that fix output voltage, constant power drivers regulate current to maintain a fixed wattage — compensating automatically as LED forward voltage shifts with temperature and load.

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Power Tolerance

Technical Overview

What Is a Constant Power Supply?

Constant power LED drivers regulate current to deliver a fixed electrical power output, ensuring stable light output across varying conditions — making them the preferred choice for professional and industrial lighting installations.

In LED lighting systems, the relationship between voltage and current is dynamic. As LEDs heat up during operation, their forward voltage decreases — and if your driver maintains a fixed voltage (as constant voltage drivers do), the current rises beyond safe levels. This causes flickering, efficiency loss, and accelerated LED degradation.

A constant power supply solves this by actively regulating current to keep total power consumption at a designed setpoint — typically within ±3% across the driver’s entire operational window. The result: consistent brightness, lower thermal stress on LEDs, and measurably longer system lifespans.

Sanpu Power Supply’s constant power LED drivers are engineered for applications where light quality, reliability, and energy efficiency are non-negotiable — from warehouse high bays to commercial track lighting systems to horticultural grow facilities.

Technical Comparison

Constant Power vs Constant Voltage

Understanding the fundamental differences helps you choose the right driver architecture for your specific application and installation environment.

Feature Constant Power Supply Constant Voltage (12V / 24V)
Power Regulation Method Regulates current to maintain fixed wattage Fixes output voltage; current varies with LED load
Best For Industrial, track, grow, outdoor, long-run applications LED strips, signage, cabinet lighting, residential
Voltage Consistency ✓ Self-correcting across temp / load changes ✗ Voltage fixed — current drifts with conditions
Energy Efficiency Higher — operates at LED’s optimal efficiency point Moderate — efficiency drops at off-design loads
Thermal Performance Superior — less heat stress on LEDs and driver Moderate — can cause overheating in demanding conditions
Design Complexity Higher — requires active power management Lower — simpler circuit design
Cable Length Tolerance ✓ Excellent — tolerant of voltage drop ✗ Poor — voltage drop reduces light output
Typical Cost Higher upfront, lower total cost of ownership Lower upfront, higher maintenance/lifespan cost

Application Scenarios

Where Constant Power Drivers Excel

Six application categories where constant power supply technology delivers measurable advantages over constant voltage alternatives.

High Bay Industrial Lighting

Warehouses, factories, and logistics centers demand consistent illumination across large areas with varying thermal conditions. Constant power ensures uniform brightness as ceiling temperatures fluctuate.

  • 100W-400W
  • High PF
  • Wide Temp Range

Commercial Track Lighting

Retail galleries and showrooms benefit from flicker-free, dimmable track systems where multiple fixtures share variable loads. Constant power provides seamless 0-10V or DALI dimming across the run.

  • 40W–150W
  • 0-10V / DALI
  • Low Flicker

Horticultural Grow Lights

Indoor farming and vertical agriculture require precise power delivery to maintain consistent PPFD (photosynthetic photon flux density) across the growing cycle, regardless of LED heat output.

  • 150W–600W
  • Full Spectrum
  • Long Lifetime

Outdoor Area & Street Lighting

IP67-rated constant power drivers power area lights, street lamps, and façade lighting where wide temperature swings, humidity, and voltage drop from long cable runs demand robust, self-correcting power delivery.

  • IP67
  • -40°C to +60°C
  • Surge Protected

LED Signage & Channel Letters

Backlit signage with long runs and mixed LED loads requires constant power’s self-balancing capability to keep illumination even across all sections without visible hot spots or dim zones.

  • 60W-200W
  • Long Run
  • Stable Output

Linear & Strip Lighting

Architectural cove lighting, shelf illumination, and decorative linear fixtures powered by runs exceeding 10 meters benefit from constant power’s resistance to voltage drop and load variation.

  • 40W–120W
  • PWM Dimmable
  • Slim Form Factor

CoMING SOON

Constant Power Product Line — In Development

Sanpu Power Supply is launching a comprehensive line of constant power LED drivers in Q3 2026. Be the first to access specifications, datasheets, and sample pricing by joining our early access list.

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