electromagnetic radiation exposure controlled visible light condition controlled visible light exposure 2013-03-13T12:12:45Z Condition during which a subject or sample is directly in the presence of or influenced by visible light, that is, electromagnetic radiation with wavelengths between approximately 390 (violet) and 770 (red) nanometers, capable of stimulating the subjective sensation of sight, at a constrained level and/or for a constrained period of time. XCO:0000284 experimental_condition_ontology jsmith