Light Emitting Diode or popularly known as LED is now used widely in home and commercial spaces. An LED bulb is smaller in size than a comparable incandescent bulb, more energy efficient and it doesn't give off a loud "pop" sound when it blows.  LED lighting works by the passing of electrons through a semiconductor, which creates electroluminescence. LED lights don’t need filaments and they don't rely on gas like neon lights. 

LED lighting is typically available in 3 different light colours (or temperatures), warm white (2700K to 3000K), cool white (3200K to 4000K) and daylight (6000K to 6500K). It also requires an additional component called a driver because it uses much lesser power hence the power supplied to the LED has to be moderated. LED also emits lesser heat than an incandescent bulb hence it is considered to be a safer choice with lower fire risk.

For cases where your LED light is not working, it could either be the driver or the LED issue. You can replace the driver (if its an external component) or the LED to find out the which is the faulty component. However if your LED light is dimmer than usual then it is most likely the lumen output of the LED is declining and requires replacement.  While LED lighting is known to be long lasting, the driver also determines the lifespan of the LED lighting so don't be surprised if your LED light doesn't last as long as you thought it would. Sometimes the shorter lifespan of your LED could be due to connection issues, ie: the live and neutral wires weren't connected properly. 

With the many advantages LED has over its rivals and its wallet friendly prices, it has become the most popular lighting in the world even replacing the iconic neon street signs in Hong Kong.