Some power tools have a small built-in or detachable LED light so that if you are working in a poorly-lit space, you can see what you’re doing. Here is an example of an LED light being used in a cordless screwdriver.
LED stands for Light Emitting Diode and is simply a small white or coloured light source.
LED lights come in many different shapes and sizes, but 5mm is usually the size that would be used on a power tool such as a cordless screwdriver.
Because they are small and compact, LED lightbulbs are perfect for use on power tools such as cordless screwdrivers.