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What is Input Voltage?

  This term refers to the voltage provided by a power supply to a device. In the context of horticulture lighting, the input voltage is typically not enough to power the light, hence the need for drivers or ballasts.  

Input Voltage vs. Operating Voltage

  In the world of grow lights, input voltage and operating voltage are two very different concepts. While input voltage is a measurement of the voltage delivered from the power supply to the ballast or driver, operating voltage refers to the actual voltage needed to operate the light.