From the standpoint of scientific research, the single greatest leap forward in the development of light sources occurred in 1895, when the German scientist Wilhelm Conrad Roentgen discovered X-rays, which allowed people to see things that the naked eye couldn't, such as a body's inner structure.
在科學研究上，對光源的開發，最大的貢獻莫過於一八九五年，德國科學家崙琴發現的Ｘ光，它讓人類得以透視肉眼看不到的、萬物的內在世界。