The rear light on your car has dual function as a safety light during times of poor visibility and more as a communication light when the vehicle is braking. Clearly visibility is the key as many accidents occur when a vehicle impacts on another vehicle in front. This can be due to human error, but a good bright rear light can reduce this. All fitted lights on any vehicle must also work correctly by law.
To ensure the quality of any replacement lights it would be wise to go for high quality