What is wavelength penetration depth?
Wavelength penetration depth refers to how deeply different light wavelengths can travel into biological tissues.
In hair restoration therapy, red light at around 650 nm wavelength penetrates the epidermis and dermis layers effectively, reaching hair follicle structures without damaging deeper tissues.
Optimizing wavelength penetration depth ensures that therapeutic light energy reaches the intended targets — the scalp and follicular mitochondria — maximizing red light therapy effectiveness for hair growth stimulation.
Related terms
Therapeutic window
Light & Technology
The therapeutic window in light therapy refers to the optimal dosage range (wavelength, intensity, and duration) that produces biological benefits without causing harm.
Visible light spectrum
Light & Technology
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.
660 nm wavelength
Light & Technology
The 660 nm wavelength refers to a specific red light frequency commonly used in therapeutic devices to stimulate biological processes.
Red Light Therapy
Light & Technology
Red light therapy is a non-invasive treatment that uses red wavelengths to stimulate cellular repair.
