But very few high school students come to her with an expertise of power tools; they come to learn. Early in the year, Andrea sets up practical “classes” after school, where students can learn the ins and outs of technical theater. “Here, we use two types of lights; Fresnel and Source Fours” she explains to a group of teenagers. The twenty-eight year old points out the different parts of the long, black Source Four. “The outer shell, or housing, is made from die-cast metal and keeps everything together” she explains as she holds the heavy light up. The bulb is towards the back, and the intensity or shape of the light can be adjusted by pulling or pushing four reflectors that stick out of the barrel of the light about halfway down. She explains that the bulb can get very hot, and turns on a nearby light. The students can feel the heat for themselves as they place their hands three feet under a light that has been on for ten minutes. She describes different accessories for the lights, such as square pieces of polyester and polycarbonate called gels that go at the end of the light and filter it to be different colors. Gobos or “goes before optics” can also be inserted to make patterns or shapes out of light.