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.

Science study Red light therapy skin dose

Decrease Wrinkles, Increase Collagen 830 nm and 633 nm Comparison

Journal:

A prospective, randomized, placebo-controlled, double-blinded, and split-face clinical study on LED phototherapy for skin rejuvenation: clinical, profilometric, histologic, ultrastructural, and biochemical evaluations and comparison of three different treatment settings

Wavelength:
633, 830
Irradiance:
Condition:
Collagen, Rejuvenation, Wrinkles, Aging Skin
Outcome:

76 patients received split face LED treatment with 830 nm, 633 nm, or a combination of 830 nm and 633 nm. The control group received a sham treatment. Patients received therapy twice a week for four weeks. Measuring skin elasticity and melanin revealed wrinkle reduction as high as 36% and up to 19% skin elacity increase. Researchers concluded that 830 and 633nm alone and in combination are effective wrinkle reducing wavelengths.

Science study Red light therapy skin dose

White (411-777) and Red (660 nm) Reduction of Wrinkles Over 12 Weeks

Journal:

The Efficacy and Safety of 660 nm and 411 to 777 nm Light-Emitting Devices for Treating Wrinkles

Wavelength:
660, Range, 411, 777
Irradiance:
Condition:
Wrinkles, Aging Skin
Outcome:

Researchers treated subjects with LED therapy the specific wavelength 660 nm (red for group 1) and a range of wavelengths from 411 to 777 nm (white for group 2). 52 women received 5.17 J daily for 12 weeks. Wrinkles significantly improved (reduced). Group 1 had slightly better results, but the differences were not significant.

Science study Red light therapy skin dose

Thyroid Safety Using LED Therapy on Neck

Journal:

The Use of a Light-Emitting Diode Device for Neck Rejuvenation and Its Safety on Thyroid Glands

Wavelength:
630, 850
Irradiance:
25 (12.5 per color)
Condition:
Collagen, Wrinkles, Aging Skin
Outcome:

30 women with no history of thyroid disease received 16 weeks of daily LED treatment in the neck area. Followup showed neck wrinkle reduction and no changes to the thyroid. This study includes only healthy participants. It does not test thyroid safety for subjects with a history of: benign thyroid disease, malignant thyroid disease, “keloid scarring, previous inflammatory or infectious skin diseases, uncontrolled medical illness, pregnancy,” or the use of growth factor-related cosmetics.

630 nm, 850 nm, 25 mW/cm2 (12.5 mW/cm^2 per color)

Red Light Therapy circulation dose

Increase Lymphatic Activity Blue, Red, and Infrared Light Dose

Journal:

Low-level laser (light) therapy (LLLT) in skin: stimulating, healing, restoring

Wavelength:
420, Range
Irradiance:
Unknown
Condition:
Acne, Collagen, Rejuvenation, Wrinkles, Hyperpigmentation, Aging Skin
Outcome:

Increase lymphatic system activity correlated:

  • reduced wrinkles
  • reduced hyperpigmentation
  • enhanced rejuvenation (glow)
  • increased collagen
  • decreased acne
Science study Red light therapy skin dose

Beauty Angel Orange, Yellow, and Red Light Dose

Journal:

A controlled trial to determine the efficacy of red and near-infrared light treatment in patient satisfaction, reduction of fine lines, wrinkles, skin roughness, and intradermal collagen density increase

Wavelength:
Range
Irradiance:
see more info
Condition:
Collagen, Rejuvenation, Wrinkles, Aging Skin
Outcome:

Reduce wrinkles, increase collagen

Science study Red light therapy skin dose

Increase Collagen Red Light Dose

Journal:

Regulation of Skin Collagen Metabolism In Vitro Using a Pulsed 660 nm LED Light Source: Clinical Correlation with a Single-Blinded Study

Wavelength:
660
Irradiance:
50
Condition:
Collagen, Wrinkles, Aging Skin
Outcome:

Reverse collagen downregulation and MMP-1 upregulation, decreasing wrinkles, and increasing collagen.

Healthy skin

Four Infrared Light Doses for Better Skin (study summary)

Journal:

Infrared and skin: Friend or foe

Wavelength:
660, 830, 805, 900
Irradiance:
50
Condition:
Collagen, Wrinkles, Aging Skin
Outcome:

Infrared Affect on Skin Review Rationale

Photobiomodulation researchers examined near infrared (NIR) studies that had resulted in damaged skin. The researchers determined that near infrared caused damage when applied in strong doses. Low dose NIR spread over time reduces wrinkles, produces collagen, and causes no harm.

Infrared Affect on Skin Review Hypothesis

Previous studies found near infrared photobiomodulation (PBM) damage because the doses were too high.

Infrared Affect on Skin Study Method

Examine PBM studies that showed near infrared light skin damage to correlate light doses with skin damage.

Infrared Affect on Skin Study Summary

In a review of Near Infrared photobiomodulation (PBM), use of near infrared light only caused damage when the dose was too high.

Near infrared light between 760 and 1,400 nm wavelengths rejeuvanates skin when applied in low (but not too low!) doses over time.

For more collagen and fewer wrinkles, use any of these wavelengths as frequently as once per day, at a dose of 20 to 50 mW/cm^2.

  • 600 nm
  • 805 nm
  • 830 nm
  • 900 nm

Infrared Review of Skin Effects Study Conclusion

  • Ultraviolet (UV) and some infrared light frequencies are always harmful to the skin
  • Near infrared with wavelengths between 760 nm and 1,400 nm are healthy when administered in a dose of 50 mW/cm^2 using any of these wavelengths: 660 nm, 805 nm, 830 nm, or 900 nm
  • Wavelengths mentioned in the previous bullet point induce more collagen and elastin; result in better skin tone and fewer wrinkles.
  • Use no more than 50 mW/cm^2, once a day or less.

“The body will absorb only so much energy before that energy damages the cytochrome cells.”

In every study reviewed, IR-A induced damage when the total energy absorbed was higher than one would receive from morning or evening sun.

Sunlight infrared is healthy when the shadows in the morning and evening, when the shadows are long. Noontime infrared creates oxidative stress. To get healthy artficial  infrared light, use no more than 50 mW/cm^2 of 660 nm, 805 nm, or 830 nm wavelength light.

EMF Channel Remarks on Infrared Review Publication

NIR frequencies can penetrate epidermis, dermis, and subcutaneous tissue.

To visualize what this means, the NIR light reaches all of this:

  • epidermis: immune system and pigment cells
  • dermis: hair follicles, nerve endings, sweat glands, oil
  • subcutaneous tissue: connective tissue, fat, blood vessels

You can’t see infrared light. If you can feel it as heat, you’re getting too much.

Interestingly, if you use a high dose but simultaneously cool the skin, you can prevent thermal damage.

But this method isn’t tested for creating a healthy response. We just know that it prevents damage, not if it creates collagen and smoother skin.

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