The science behind LED light therapy. Photoreceptors in skin cells and mitochondria response. ATP production and collagen stimulation explained. How at-home LED masks work including LEDs, penetration depths, and honeycomb matrix design. Red for anti-aging, Blue for acne, Infrared for deep repair. Why LED masks are safer than other treatments. What makes a mask effective. Usage: 15 to 20 minutes, 3 to 5 times per week. Results timeline included.