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A medical illustration showing the penetration depth of different LED light wavelengths (from 380nm purple to over 950nm infrared) through the epidermis, dermis, and hypodermis layers of the skin. The legend explains that blue light destroys bacteria, green regulates melanin/melatonin, yellow stimulates lymphocytes, and red increases collagen and blood circulation

Red Light Therapy Wavelengths: How to Choose 660 nm vs. 830 nm by Tissue Depth

April 8, 2026 April 13, 2026

T02 Laser hair growth helmet — product image

LED vs. Laser in Photobiomodulation: Performance, Safety & Device Selection Guide

April 8, 2026 April 13, 2026

LED light penetrates the skin

Downstream Biological Effects of Photobiomodulation: What Happens Inside Your Cells

April 8, 2026 April 13, 2026

LED light penetrates the skin

Biphasic Dose Response in PBM: Why More Light Is Not Always Better

April 8, 2026 April 10, 2026

A scientific 3D cross-section diagram of human skin illustrating light-penetration depth. It shows various light wavelengths from 420nm to 850nm entering the epidermis, dermis, and subcutaneous layers, demonstrating that longer wavelengths (like 850nm) penetrate deeper into the tissue than shorter ones (like 420nm).

Cytochrome c Oxidase: The Primary Photoacceptor in Red Light Therapy

April 8, 2026 April 10, 2026

Red light wavelength

What Is Photobiomodulation? Definition, History & How It Works

April 8, 2026 April 10, 2026