The pace of replacing the lower efficient candescent lamp s is growing up, the substitute is so-called efficient lamps. When the next generation lamps come up, led high bay will be a better choice for efficient lamps.As more and more voices which require eliminating the candescent lamps, there is a question, do we really need to abandon the candescent lamps? The industrial professors think that the candescent lamp also has its own advantages even some light sources don’t have such as instant on, continuous spectrum, 100 percent color rendering. The most important is continuous spectrum for it is no harm to human eyes. Until now, there are still some candescent lamps applications in the hotel, museum, and business club.