LED lightings represent a green light source which offers energy saving and long lifespan advantages. Nowadays, it has been popularized in our daily life. It has continuously replaced lighting devices such as incandescent lighting and fluorescent lighting. Either in household life or working environment, lighting fixtures are closely linked to you and us. Today’s LED lighting products can be problematic with blinding light, glare, high light loss and insufficient light source. Long-term usage can provoke uncomfort such as eyestrain. As modern man are conscious of environ...