The primary light source in a classroom is usually:

The primary light source in a classroom is typically fluorescent. Fluorescent lighting is common in educational settings due to its energy efficiency, long lifespan, and the ability to produce a bright, even light that enhances visibility and reduces eye strain. This type of lighting is also effective for illuminating large spaces, which is ideal for classrooms that often accommodate multiple students and require adequate lighting for various activities, including reading, writing, and instructional demonstrations.

Natural light, while beneficial, is less reliable and varies significantly depending on the time of day and weather conditions. Soft or tinted lighting, though it can create a pleasant ambiance, does not generally provide the necessary brightness for instructional settings. Incandescent lighting, while warm and inviting, is not as energy-efficient as fluorescents and tends to generate more heat, making it less suitable for classrooms where long hours of use are common. This context reinforces the preference for fluorescent lighting in educational environments.