How do you power an LED light?
The simplest way to power an LED is to use a DC constant voltage source that is already powering other electronics in the circuit. Current can be controlled with a series resistor. See Figure 3. This is inexpensive and convenient, especially if power is already being supplied to other components.
Do LED strip lights need a transformer?
LED light strips may be powered with LED drivers, but longer strips should use an LED transformer. Although LED drivers provide a constant output voltage, longer strip lengths require a higher wattage to run at peak efficiency.
Can I power 12V LED strip with USB?
So, in short: no. If your LED strip needs 12V, you need to connect it to a 12V power supply, not a USB port. … As @dandavis suggested in the comments, if you really want to power it from USB, you can get a 5V->12V step-up converter to get 12V from your USB supply.
How do you connect LED strip lights to mains?
To get your strip light working, connect the transformer / driver to the strip light ( extending the cable with 2 core flex if necessary). Then you connect your transformer / driver to the mains via a plug or direct to the mains and you’re away.