While harvesting solar energy comes to mind first, technology now enables harvesting even from indoor lighting sources. IoT devices can be powered by ambient indoor lighting with the help of highly efficient solar panels and a right-sized energy storage element added to the device.
A transformer is a device designed to help lighting systems reduce high voltages. This transition from high to low voltage is referred to as “step-down.”
When selecting a regulated power supply, you’ll need to know the electrical specifications required for a device, such as line regulation.