Select the driver with the LED module and control system. A replacement with the same wattage can still have the wrong output type, current range, dimming interface, or thermal rating.
Match the electrical output
Identify whether the light source requires constant current or constant voltage. Check the output range, rated current, load limits, isolation, and supply voltage. Use the fixture manufacturer’s approved replacement where available.
Compare input behavior at the intended load
Request input watts, power factor, harmonic data, and inrush current for the relevant operating point. Use the limits applicable to the product and market. A single percentage quoted without load conditions is hard to compare.
Request measured dimming performance
Check flicker data at full output and the dim levels the project will use. Ask for the measurement method and settings. Test startup, low-end stability, and recovery after power interruption with the proposed control device.
Specify the interface precisely
Phase-cut, 0–10V, DALI, and PWM describe different control arrangements. Confirm wiring, control polarity where relevant, minimum level, dim-to-off behavior, and compatible products. Do not approve a substitute solely because both labels say dimmable.
Check thermal limits and replacement access
Review the rated ambient and case temperatures and how the driver is mounted. Ask whether it can be replaced without damaging the fixture and how long an approved replacement will be available.
Keep the driver on the bill of materials
Record the exact manufacturer, model, settings, connector arrangement, and approved alternatives. Match test reports and product declarations to the complete fixture configuration.
Frequently Asked Questions
Can I replace a driver with one of the same watts?
Wattage alone is insufficient. Match the output type, voltage and current requirements, controls, safety characteristics, and thermal conditions.
Does a good driver guarantee no flicker?
Performance also depends on the LED load, dimmer, settings, and installation. Test the complete combination.