抄録
White LED is an original technology of our country. It is attracting much attention as "the fourth light source". This article discusses current LEDs and challenges in LEDs, which are now facing a turning point in the history of the illuminations. Taking advantage of the characteristics of LEDs, outputs and luminous efficacy have been improved, and LEDs quickly come to be adopted increasingly as indoor lighting, such as those for business space and residences. LEDs have become popular in applications for general illuminations, but there are some remaining challenges that need to be solved before LEDs are further adopted. Such challenges include improvement in comprehensive luminous efficacy, improvement in reliability, improvement in quality of light, compliance to regulations, understanding of and communication about performance, researches for illumination adaptability, enhancement of standardization, and application development.
