Students are often intrigued by the idea that different colors of light possess different amount of energy. This fascinating, hands-on lesson will 'shine a light' on the concept in a way your students won't forget! A do-it-yourself tabletop version of one of the most famous physics experiments of all time - the photoelectric effect. Using a red laser pointer and an array of colored gel filters, your students will discover which colors of light are able to 'charge up' a phosphorescent square. Kit includes a 3 x 3 inch phosphorescent vinyl square, red laser pointer, a flashlight, four transparent gel filters in red, blue, yellow, and violet, and a lesson plan with student handouts.