Constant current LED drivers are power supplies that deliver a fixed, stable electrical current (measured in milliamps or mA) to high-power LEDs. Their job is to protect sensitive LEDs from burnout by ensuring they always receive the exact current they need to operate safely and efficiently. If your fixture's spec sheet calls for a specific mA rating, you need a constant current driver.
For fixtures that require constant-voltage output instead, review our 24V LED drivers and match the supply to the product specification.
When Should I Use a Constant Current Driver?
You should use a constant current driver when your LED fixture's technical specifications demand it. Check the specs for terms like "mA" or "Constant Current." Common uses include:
- High-Power Fixtures: Specification-grade downlights, spotlights, and track lights.
- Landscape Lighting: In-ground well lights and other powerful outdoor fixtures.
- COB (Chip on Board) LEDs: High-density LED arrays that require precise power.
- Series-Wired LEDs: Any project where multiple LED chips are connected in a single string.
How to Select the Right Constant Current Driver
Matching a constant current driver to your LEDs is a technical process that requires precision.
Step 1: Match the Output Current (mA) Exactly
This is the most critical step. The output current of the driver must match the current rating of your LED or fixture (e.g., 350mA, 500mA, 700mA). Supplying too little current will result in dim light, while supplying too much will quickly and permanently destroy the LED. There is no flexibility on this specification.
Step 2: Verify the Output Voltage Range
Every constant current driver has a specific output voltage range (e.g., 3-32VDC). You must calculate the total forward voltage (Vf) of all LEDs you are connecting in series. The total Vf of your LED string must fall within the driver's specified voltage range. If the total voltage is too low or too high, the driver will not operate correctly.
Step 3: Check Power and Wattage
Ensure the driver's maximum wattage is sufficient to power your LEDs. You can calculate the required wattage by multiplying the total forward voltage of your LED string by the current in amps (e.g., 350mA = 0.35A). Like with other drivers, having a 20% buffer is a good practice.
Step 4: Confirm Dimming Method
If you need dimming, select a dimmable constant current driver. The most common dimming method for these drivers is Constant Current Reduction (CCR), often controlled by a 0-10V or Triac (ELV/MLV) wall dimmer. Ensure the driver's dimming type is compatible with your control system.
Find the Right Driver for Your High-Power LEDs
Powering high-performance LEDs requires a driver that delivers precise, reliable current. Bees Lighting offers a wide range of constant current LED drivers with various output ratings to meet the demands of any technical specification. Browse our collection, paying close attention to the current and voltage ratings to find the perfect match for your fixture.
