• 1 LED flashlight, any size although ideal if they are all the same across groups so as to be able to compare results across groups; available at Amazon or home improvement stores like Home Depot., such as a three-pack for ~$10 at http://www.homedepot.com/p/Defiant-80-Lumens-LED-Flashlight-3-Pack-HD15FL04-3/206525460
• red, blue, yellow and green acetate film cut into rectangular strips sized to cover the flashlight outer lens, one of each color per group; available at various vendors such as www.utrechtart.com
• (optional) white paper, 2 sheets per student, to serve as journals
• pencils
• ruler
• black butcher paper, 6 feet; alternatively; black construction paper
• computer, on which to look at online videos/articles and run the PHET Color Vision interactive simulation at https://phet.colorado.edu/en/simulation/legacy/color-vision, which requires Java to run, which is available at https://java.com/en/download/mac_download.jsp

To share with the entire class:

• (optional) computer with Internet access and projector, to show the class an online video; alternatively: have students use their individual team computers