Voltage is electrical potential difference, measured in volts (V). A lighting specification uses it to identify the supply a fixture or power supply is designed to accept.
Read the input label
An input marked 100–240 V AC identifies a range of alternating supply voltage. A separate 48 V DC input has a different requirement. Matching a connector shape does not establish compatible voltage, polarity, current capacity or pin assignment.
Practical example
A fixture can have a mains-powered control box and a lower-voltage connection between the box and head. Read the label for the connection being used rather than applying the control box’s mains range to every socket. Battery inputs can also have specific permitted voltage ranges and output limitations.
Voltage and current
A regulated power supply delivering similar real input power generally draws more current at a lower supply voltage, with power factor also affecting AC current. That relationship does not mean increasing voltage increases a fixture’s permitted output. Use the manufacturer’s ratings for the actual supply and operating mode.
Equipment examples
The Aputure LS 600x Pro entry identifies its AC supply requirements separately from its DC-power options.
Related terms
Amperage · AC Power · DC Power · Power Factor
References
Fluke: voltage, AC and DC · NIST: SI base and derived units · Aputure: LS 600x Pro specifications