Does red or near-infrared light actually penetrate bone? This hands-on red light therapy bone test uses real spectrometer measurements through tibia and skull to show how much light gets through, which wavelengths work best, and what it means for brain and deep-tissue therapy.

Red light therapy, or photobiomodulation, is backed by decades of research. This practical guide explains how it works, where the evidence is strongest, what to expect, and how to use it safely for recovery, pain, and overall wellbeing.

In this test, I compared flashlights, spotlights, and reading lamps to red light therapy devices. I measured their red and near-infrared output, beam strength, and coverage to see if they can deliver real photobiomodulation results.