What is the visible light spectrum?
The visible light spectrum is the range of electromagnetic wavelengths that are perceptible to the human eye, typically spanning from about 380 nm to 750 nm.
Therapeutic red light used in Photobiomodulation (PBMT) falls within this visible range, specifically around 630–660 nm, where it effectively interacts with biological tissues.
Understanding the visible light spectrum helps optimize device design and treatment protocols in red light therapy for hair regrowth applications.
Related terms
Wavelength penetration depth
Light & Technology
Wavelength penetration depth refers to how deeply different light wavelengths can travel into biological tissues.
Low-level laser therapy (LLLT)
Light & Technology
Low-level laser therapy (LLLT) is a treatment that uses low-intensity lasers or LEDs to stimulate cellular activity without heating tissues.
Laser Diode
Light & Technology
A laser diode is a semiconductor device that emits light at a specific wavelength.
Red Light Therapy
Light & Technology
Red light therapy is a non-invasive treatment that uses red wavelengths to stimulate cellular repair.
