How Does LED Light Therapy Work? LED therapy works by delivering specific wavelengths of light into the skin. These wavelengths penetrate at different depths and stimulate natural cellular processes, without causing damage to the skin's surface. When the light energy is absorbed by the skin, it triggers biological responses such as increased collagen and elastin production, reduced inflammation, improved circulation, and targeting acne-causing bacteria. Unlike harsher treatments, LED therapy is completely painless and requires no downtime, making it suitable for regular use.