Light Dose Database

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This is the EMF Channel database of light therapy study doses. After getting the results, click to view more study details. Only successful studies are included. 99% of the studies here are on humans, not animals. This database is a work in progress. Many thanks to Vlad for his PBM database. When the data here references his work, the detail page includes a link to the PBM spreadsheet.

red light therapy for hair growth dose

Combining 590 nm Light with Minoxidil to Increase Hair Growth

Journal:

Low-Level Light Therapy Downregulates Scalp Inflammatory Biomarkers in Men With Androgenetic Alopecia and Boosts Minoxidil 2% to Bring a Sustainable Hair Regrowth Activity

Wavelength:
590
Irradiance:
Condition:
Hair Growth
Outcome:

Researchers tested low level light therapy to see if it would reduce scalp inflammation that interferes with hair re-growth. They tested the L’Oréal LLLT/GentleWaves® device’s effect on hair growth. 64 men with androgenetic alopecia received 590 nm for 70 seconds (pulsed) 1x/day for 3 days. Their scalps were DNA squenced. Then they tested the device as well as Minoxidil on 135 men and women with alopecia. The 590 nm treatment correlated with downregulation of sclap inflammatory biomarkers in half the treated subjects. The second study showed increase Minoxidil hair growth. Those receiving 2% Minoxidil responded as if they had received 5% Minoxidil.

red light therapy for hair growth dose

Infrared Plus Minoxidil Superior to Minoxidil Alone at Growing Hair

Journal:

The effectiveness of adding low-level light therapy to minoxidil 5% solution in the treatment of patients with androgenetic alopecia

Wavelength:
785
Irradiance:
10-50 mW/cm^2
Condition:
Hair Growth
Outcome:

Researchers tested 785 nm (infrared) light on balding patients aged 17 to 45 years old.

The treated group received 5% minoxidil solution and infrared light therapy two times per day.

The control group received 5% minoxidil and a sham LED treatment device.

Researchers tested hair patient satisfaction,  hair density and hair growth.

At 12 months, the patients getting both minoxidil and LED ligh therapy were singificantly happier with their hair growth than the sham group.

red light therapy for hair growth dose

Increase Hair Coverage with 660 nm Red LED Light

Journal:

Efficacy and Safety of a Low-Level Light Therapy for Androgenetic Alopecia: A 24-Week, Randomized, Double-Blind, Self-Comparison, Sham Device-Controlled Trial

Wavelength:
650, 660
Irradiance:
Unknown
Condition:
Hair Growth
Outcome:

Researchers applied 660 nm LED light to balding men and women over a 24 week study.

The light therapy significantly increased the hair’s coverage area.

More of the subject’s heads had hair at 24 weeks than at the beginning of the study.

The sham group saw no hair gains.

Researchers also used 650 nm red laser light, and got the same results.

 

red light therapy for hair growth dose

Helmet LED Treatment Grows Hair

Journal:

The Effectiveness of Combination Therapies for Androgenetic Alopecia: A Systematic Review and Meta-Analysis

Wavelength:
655
Irradiance:
Condition:
Hair Growth
Outcome:

Researchers treated balding men and women aged 19 to 65 years old with 655 nm red light therapy (LLLT: low level light therapy).

They fitted helmets with 2.36 mW LED 655 nm output to administer the treatment.

They tested hair growth at 0, 8 and 16 weeks.

At the end of 16 weeks, particpants in the treatment group had more hairs and they were thicker as well.

The control group did not experience an increase in hair quanity or thickness.

There were no adverse side effects.

 

red light therapy for hair growth dose

Hair Regrowth and Lichen Planopilaris Symptom Reduction

Journal:

Effectiveness Of Low-Level Laser Therapy In Lichen Planopilaris

Wavelength:
650, 660
Irradiance:
unknown
Condition:
Hair Growth
Outcome:

Researchers treated patients to low level light therapy (LLLT) using red light with a  630 nm wavelength.

All treated patients had lichen planopilaris.

Symptoms included redness (erythema), corkscrew hairs indicating too much keratin production (perifollicular hyperkeratosis), and hair loss.

After 3 and 6 months, the patients had more and thicker hair.

After 3 months, the erythema and perifollicular hyperkeratosis settled down, but after 6 months it had returned.

 

red light therapy for hair growth dose

Four Successful Lichen Planopilaris Red Light Cases

Journal:

Lichen Planopilaris and Low-Level Light Therapy: Four Case Reports and Review of the Literature About Low-Level Light Therapy and Lichenoid Dermatosis.

Wavelength:
650, 660
Irradiance:
unknown
Condition:
Hair Growth
Outcome:

Researchers reviewed four cases using red light to treat licehn planopilaris (LPP).

Using 650 nm or 660 nm light scientists reversed inflammation, LPP symptoms, and regrew natural hair.

They wrote that the patients showed “a dramatic response to LLLT [red light therapy].”

Patients experienced no adverse side effects.

red light therapy for hair growth dose

Hair Growth in Women Red Light Dose

Journal:

The Growth of Human Scalp Hair in Females Using Visible Red Light Laser and LED Sources

Wavelength:
655
Irradiance:
255
Condition:
Hair Growth
Outcome:

Increase female scalp hair count.

About the EMF Channel Light Dose Database

Many people purchase red light therapy or neuromuscular electrical stimulation devices without knowing optimal doses for the results they want to see. The right dose is especially key to light therapies, which have optimal windows of wavelength and energy delivered. Treatment doses outside of those windows will nullify results or harm the user. I took the results from successful EMF studies when these studies included:

  • Photobiomodulation (Red Light Therapy, Blue Light Therapy, Low Level Light Therapy)
  • Transcutaneous Electromagnetic Nerve Stimulation (TENS)
  • Pulsed Electromagnetic Field (PEMF) Therapy
  • Neuromuscular Electrical Stimulation (NMES)

Many studies do not report exact dose parameters they used. They are therefore not included here, even the study reported a therapeutic result.

Light Dose Parameters
Term
Parameter
Time
Seconds
Power
milliwatts (mW) or Watts (W)
Total Dose Energy
joules (J) = power x time = Watts x seconds
Wavelength
nanometers
Frequency
Hertz (Hz)
Spot Size
cm(2) (centimeters squared)
Duty Cycle
percentage of time light source is on during one cycle
Power Density (or Intensity)
Watts per centimeters squared (W/cm(2) = power / probe size
Energy Density (Fluence)
jules per centimeters square (J/cm(2)) = total energy delivered by the probe size

Source: Turchin, Curtis. Light and Laser Therapy: Clinical Procedures 6th Edition (p. 16)

Image by Thomas-Suisse from Pixabay