What is the range of wavelengths for polychromatic light?

Polychromatic light refers to light that contains multiple wavelengths across the visible spectrum and can extend into the ultraviolet and infrared regions. The range of wavelengths typically recognized as polychromatic light spans from approximately 400 nanometers (nm) to 1000 nm. This range encompasses the visible light spectrum (roughly from 400 nm to 700 nm) while also including wavelengths that fall outside of the visible spectrum, extending into the near-infrared region.

Understanding the significance of this range is important, especially in esthetics and light therapy, as different wavelengths are utilized for various skin treatments, including photorejuvenation and other light-based therapies. By recognizing that polychromatic light includes a variety of wavelengths, practitioners can better understand how light interacts with skin and can optimize treatments for effective results.