Moreover, exit sign lights and emergency lighting have a 3-hours backup battery, which would be installed in a position near the exit door, stairwell and corridor, will lead the people leave this building safely.In consideration of the building energy saving, LED lighting system are the most popular lighting design for the whole building. In compare with the traditional fluorescent lamps, the lighting power would be reduced almost 85% by using the LED lighting.LED is designed to focus its light and can be directed to a specific location without the use of an external reflector, achieving a higher application efficiency than conventional lighting. Well-designed LED illumination systems are able to deliver light more efficiently to the desired location.