Driver & Transformer FAQ
What is the difference between constant voltage and constant current LED drivers?
Constant Voltage (CV) drivers:
Provide fixed output voltage (e.g., 12V, 24V)
Used for LED strip lights and most architectural linear lighting
Constant Current (CC) drivers:
Provide fixed current (e.g., 350mA, 700mA)
Used for LED modules, downlights, and high-power LEDs
Selecting the wrong type can damage the LED load.
How do I size an LED driver for a project?
Driver sizing formula:
Total Load (W) × 1.25 = Minimum Driver Capacity
Example:
Load = 160W
Driver required ≥ 200W
This ensures thermal stability and long-term reliability.
What is the maximum loading recommended for LED drivers?
Recommended loading:
70% – 80% of rated capacity
Benefits:
Reduced heat generation
Extended driver lifespan
Improved system stability
What is the difference between Class 2 and non-Class 2 drivers?
Class 2 drivers:
Limited power output (typically ≤ 96W)
Safer installation
No conduit required in many cases
Non-Class 2 drivers:
Higher wattage
Used for large installations
May require additional electrical protection
What dimming options are available for LED drivers?
Common dimming protocols include:
TRIAC / ELV (phase-cut dimming)
0–10V dimming
Driver and dimmer compatibility must be verified before installation.
What is voltage drop and how does it affect LED strip installations?
Voltage drop occurs when voltage decreases along the length of the LED strip due to resistance.
Effects:
Brightness reduction
Color inconsistency
Solutions:
Use 24V systems
Shorten run lengths
Feed power from both ends
Use thicker gauge wire
Can multiple LED strips be connected to one driver?
Yes, provided:
Total load does not exceed driver capacity
Wiring is properly distributed
Voltage drop is managed
Parallel wiring is recommended.
What IP ratings are available for LED drivers?
IP20 → Indoor use
IP65 → Damp / outdoor use
Driver selection must match installation environment.
What certifications should LED drivers have?
Common certifications:
UL / cUL
Class 2 compliance
Class P
RoHS
FCC (for electronic compatibility)
Certification ensures safety and code compliance.
What is power factor in LED drivers?
Power Factor (PF) indicates how efficiently electrical power is used.
PF ≥ 0.9 is recommended for commercial applications.
Higher PF reduces energy loss and improves system efficiency.
What protection features should LED drivers include?
Professional-grade drivers include:
Overload protection
Short circuit protection
Over temperature protection
Over voltage protection
Can LED drivers be installed in enclosed spaces?
Drivers should not be installed in fully sealed environments without ventilation.
Poor ventilation can lead to:
Overheating
Reduced lifespan
Failure
Can drivers be used with control systems?
Yes. Many drivers are compatible with:
0–10V systems
DALI systems
Smart lighting controls
Compatibility must be verified.