What is a defining feature of fluorescent lighting?

Fluorescent lighting is characterized by its emission of light that is rich in the blue and green wavelengths while lacking significant output in the red spectrum. This results from the type of phosphor coatings used inside fluorescent lamps, which are designed to convert ultraviolet light into visible light, primarily in those shorter wavelengths. The absence of substantial red light is notable because it gives fluorescent lights their distinctive color appearance, which can often appear cooler or harsh compared to traditional incandescent lighting that emits a more balanced spectrum, including more red wavelengths.

The emphasis on blue and green wavelengths makes fluorescent lighting more energy-efficient compared to conventional incandescent bulbs, which produce light across a broader spectrum. This specificity in wavelength output is fundamental to understanding how fluorescent lights interact with color perception in various environments, which can influence design choices in residential and commercial spaces.