Red light therapy is gaining popularity due to its diverse health benefits – from anti-aging and pain relief to deep muscle regeneration. However, to truly harness these benefits, correct dosing is essential. This guide explains in an understandable and personal way how to optimally dose red light therapy and adapt it to your individual needs.

The Basics of Dosing in Red Light Therapy

The correct dosage depends on various factors: power (irradiance), wavelengths, distance from the light source, exposure time, and specific therapeutic goals. The aim is to supply cells with sufficient light without over- or under-exposing them.

Irradiance

Irradiance is measured in milliwatts per square centimeter (mW/cm²) and describes how intensely light hits a specific area. Studies show that positive effects of red light therapy occur at light outputs between 20 - 200 mW/cm².

An example for calculation:

If a 200-watt device emits light over an area of 2000 cm², the power is as follows:

200,000 mW / 2000 cm² = 100 mW/cm²

An irradiance between 50 - 100 mW/cm² is optimal for most applications. Typical heilys Gen Panels have an average irradiance of 80 mW/cm².

Factors Influencing Irradiance

1. Distance from the Light Source: Intensity decreases dramatically with increasing distance. Optimal distance: 15 cm - 90 cm.

2. Wavelengths: Effective wavelengths are primarily in the red spectrum (620–700 nm) and near-infrared spectrum (700–1000 nm).

3. Device Size and Treatment Area: Larger devices cover more area and save time.

4. Actual vs. Stated Power: Often, the actual irradiance is 25-50% below the stated power. A PAR meter can help here.

Exposure Time

The total dose value is calculated by multiplying the irradiance by the exposure time:

Dose (J/cm²) = Irradiance (mW/cm²) × Time (Seconds) × 0.001

For general applications, a value between 3 - 50 J/cm² is recommended, depending on whether superficial or deeper tissue layers are being treated.

Optimal Dosing for Various Applications

Skin Problems (Anti-Aging, Acne, Infections)

• Distance: 30 - 90 cm

• Dose Range: 3 - 15 J/cm² per area

• Optimal Exposure Time:

  • 1 - 4 minutes at 30 cm distance

  • 1.5 - 5 minutes at 45 cm distance

  • 2 - 7 minutes at 60 cm distance

  • 3 - 14 minutes at 90 cm distance

Pain Relief & Muscle Regeneration

• Distance: 15 - 30 cm

• Dose Range: 10 - 60 J/cm² per area

• Optimal Exposure Time:

  • 2 - 7 minutes at 15 cm distance

  • 5 - 10 minutes at 30 cm distance

Inflammation Reduction

• Distance: 15 - 30 cm

• Dose Range: 10 - 40 J/cm²

• Treatment Duration: 2 - 10 minutes, depending on the intensity of the inflammation.

Eye Health (Vision Improvement)

• Distance: 30 cm

• Dose Range: 3 - 15 J/cm²

• Exposure Time: 1 - 5 minutes

• Studies show that daily applications of 670 nm light for 3 minutes in the morning can lead to significant improvements.

Immunity Boost

• Distance: 30 cm

• Dose Range: 10 - 30 J/cm²

• Treatment Duration: 5 - 10 minutes on the chest and neck area.

Melatonin Production & Sleep Quality

• Distance: 30 - 60 cm

• Dose Range: 3 - 15 J/cm²

• Treatment Duration: 5 - 10 minutes, preferably in the evening.

Muscle Regeneration After Exercise

• Distance: 15 - 30 cm

• Dose Range: 20 - 50 J/cm²

• Treatment Duration: 5 - 15 minutes on affected muscle groups.

Biphasic Dose Response

The phenomenon of biphasic dose response states that both too low and too high doses lead to minimal or no effects. The optimal effect lies between these two extremes.

Biphasic Dose Response - Superficial Skin (heilys Gen Panel, 80 mW/cm²)

Optimal dose range: approx. 15 J/cm²

Biphasic Dose Response - Deeper Tissue (heilys Gen Panel, 80 mW/cm²)

Optimal dose range: approx. 40 J/cm²

Important Note: Irradiance vs. Exposure Time

For better cellular absorption, it is often beneficial to reduce irradiance and extend exposure time. Slower cell charging allows them to absorb light naturally, leading to deeper and more sustainable effects.