Recently the examples of a lighting design with LED source have increased rapidly, but there are few researches that are related to selecting luminous colors by LED. The research is that respondents operated color blender and got preference colors according to what they made, the colors were measured by chroma meter and marking CIE 1931 chromaticity diagram. Through the results of the research has made group preference for luminous colors. From now on, not only does it seem capable of using a designing a building-lighting to which LED but it will be actively applied to controlling with a digital technology for lighting design.