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
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.
Intense Pulsed Light (IPL)
Light & Technology
Intense Pulsed Light (IPL) is a broad-spectrum light therapy that emits multiple wavelengths.
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.
Photoreceptors
Light & Technology
Photoreceptors are specialized molecules or proteins that detect and respond to light energy.
