The wavelength of red light used in red light therapy typically ranges between 620nm (nanometers) and 700nm. Each wavelength within this range offers specific benefits:

Key Wavelengths and Their Effects

1. 620–660nm (Visible Red Light)
   • Benefits:
     • Stimulates collagen production.
     • Enhances skin elasticity and reduces wrinkles.
     • Improves circulation and skin tone.
   • Applications: Skin rejuvenation, fine lines, wrinkles, and acne scars.
2. 800–850nm (Near-Infrared Light)
   • Benefits:
     • Penetrates deeper into the skin and tissues than visible red light.
     • Reduces inflammation and pain in muscles and joints.
     • Enhances cellular repair and regeneration.
   • Applications: Pain relief, muscle recovery, and deep tissue healing.

Why Wavelength Matters

• Depth of Penetration: Longer wavelengths penetrate deeper into the skin and tissues. For example:
  • 660nm: Penetrates skin layers (up to 1-2mm), making it ideal for treating superficial skin concerns.
  • 850nm: Penetrates deeper (up to 5mm or more), targeting muscles, joints, and deeper layers of the dermis.
• Targeted Benefits: Devices with specific wavelengths (or a combination) allow users to customize treatments based on their needs, such as skin rejuvenation or pain management.

Optimal Wavelengths for Specific Uses

• Skin Rejuvenation: 630–660nm.
• Acne Treatment: 630–650nm (combined with blue light for bacteria reduction).
• Anti-Inflammation: 800–850nm.
• Pain Relief and Muscle Recovery: 850nm and higher.

Combination Therapy

Many red light therapy devices combine red light (620–660nm) and near-infrared light (800–850nm) for comprehensive benefits. For example:

• Red light addresses surface-level skin issues.
• Near-infrared light penetrates deeper, reducing inflammation and promoting cellular repair.

When choosing a device, ensure it lists the specific wavelengths it uses. Devices that include dual wavelengths (660nm and 850nm) are often considered the most versatile and effective.