A good place to start when looking for ways to mimic sunlight is to think about plants. When the sun emits light, the light waves travel to the earth and are absorbed by plants. The plants use this light in photosynthesis to help the plants grow. Plants are able to absorb light of many colors, and so they grow best when they are exposed to light sources that give them a full spectrum of colors, like the sun (except green, since plants usually reflect green light, making them appear green in color). So, a light bulb that mimics the sun is also good for helping plants grow. A light bulb that mimics sunlight is called a full-spectrum bulb, and can be found in hardware stores and online. Good luck with your demonstration!