This document provides an overview of continuous lighting sources that can be used for studio photography. It discusses hot lights such as photofloods, HMI, and quartz lights, as well as cold lights powered by fluorescent bulbs. It also defines key lighting terms like color temperature, watt-seconds, and guide number. The document focuses on monolights as a type of studio flash that offers variable power outputs and modeling lights to preview lighting effects. It provides examples of affordable monolight options and factors to consider when shopping for a monolight, such as continuously variable output and proportional modeling lights.