Nowadays, LED light bulbs are increasingly replacing traditional lights for LED has a lot of advantages over conventional light source. LED light bulb exceeds the efficacy of any incandescent, halogen and fluorescent lamp, and has a much longer life span than these lamps. Though, the initial cost of LED lamp is higher, it will reduce the cost of maintenance. That is to say, LED light reduces total-cost-of-ownership (TCO). In addition, it doesn’t contain mercury or emit UV during operation. As for its usage, there are many applications, such as general illumination including indoor and outdoor and portable lighting, electronic signage and indication, backlighting and video screen, automotive, forward and directional lighting, and advertisement and retail lighting, etc. There are many LED products, for example, LED strip with its flexibility, wide application and easy installation, is becoming more and more popular for both aesthetic and functional purposes. LED G4 with its small size and high luminous output, is universally applied in groups to compose a lamp.
Cree Inc., located in America, manufactures semiconductor materials and devices. Though it has many competitors, including Nichia Corporation, Osram Opto Semiconductors, Philips Lumileds Lighting Company, Seoul Semicondutor, GE Lumination, Epistar and Everlight Electronics, Cree is a leading innovator of lighting-class LEDs, LED lighting, and semiconductor solutions for wireless and power applications. It has various products such as LED fixtures and bulbs, high-brightness LEDs, lighting-class power LEDs, power-switching devices and radio-frequency/wireless devices. Cree aims at leading LED market and enabling customers’ products with LED innovations and technology. For instance, XLamp XR-E is a white, blue or green LED mounted on a 7 by 9 mm base with a maximum drive current of 700-1000 mA and a viewing angle of 90-100 degrees, rated for 50,000 hours. Additionally, there are many types of LED light bulb. LED GU10 and LED MR16 are among the most common types. With the rapid development of LED technology, LED lights are surely an ideal replacement for conventional ones.