We had conducted a research and development (R&D) about one of the physics instructional media namely smoky glass box on the light subject. This research aimed to produce proper smoky glass box instructional medium based on the validity, practicality, and effectiveness of the media.The type of research is research and development which refers to the ADDIE model. The subjects of the try out were the eight grade of SMPN 9 Banjarmasin. The instruments of this research were validation sheet, questionnaire, and learning outcome test. The results showed that: (1) the category of validity media is highly valid, (2) the category of practicability media is good, and (3) the category of effectiveness media is high. Based on the results of the research smoky glass box instructional medium is proper to use in learning physics.