We have developed two kinds of optical experiments: color mixture and fluorescence, using mini-torches with light emitting diodes (LEDs) that emit three primary colors. Since the tools used in the experiments are simple and inexpensive, students can easily retry and develop the experiments by themselves. As well as giving an introduction to basic optics, the developed experiments are expected to help students to understand how the science they learn in school is used in their daily lives. (Contains 10 figures.)