LED technology requires a specific driver (aka power supply) in order to properly operate a given lamp, module, or fixture.  Unlike former technologies like fluorescent and HID technologies, LEDs have a multitude of options that can be selected from and should be verified prior to changing out by a lighting professional.  With the evolution of lighting technologies, many pre-existing drivers may have become discontinued, obsolete, and/or transitioned to new models.

LED drivers are either constant current or constant voltage. Constant current drivers can power LEDs directly. Constant voltage drivers typically power an IC (Integated Circuit), which provides a constant current to the LED string.

LED drivers come with various specifications and features. The most important ones are:

Output power (W):
– Example: 20 W for a spot light or 150 W for a street light

Input voltage (V):
– Example: 120 V or 240 V or 277 V or 347- 480 V

Output current (mA):
– Example: 700 mA or 1050 mA

Output voltage (range) (V):
– Example: 24.5 V – 30.5 V

– Example: 0-10 V, dim-to-off, Triac, ELV, DALI or PWM


  • Indoor vs. outdoor
  • IP rating
  • Safety certifications
  • Form factor
  • Controls ready / wireless
  • Sensor ready
  • Auxiliary output voltage
  • Tunable white
  • DMX

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