What is the primary light source in classrooms?

• A. Fluorescent
• B. LED
• C. Incandescent
• D. Halogen

Answer: (A)

Classrooms are designed for even, glare-free illumination over a wide area to support reading, writing, and teacher presentation. Fluorescent lighting has long been the primary source because it provides bright, diffuse light across large spaces at a relatively low operating cost. It achieves a good balance of lumen output per watt, relatively low heat compared to incandescent or halogen, and fixtures that can be arranged to minimize shadows on desks and boards. While LED is now common and highly efficient, fluorescent lighting has historically been the standard in many classrooms, which is why it is identified as the primary light source. Incandescent and halogen produce more heat and are less energy-efficient for the same light output, making them less suitable as the main classroom lighting.