Someone on your skin care forum cleared up her rosacea with her red light therapy (RLT) device. She is happy to give you her treatment regimen, but you do not know how to get this dose with your device. Can you even get the same dose of red light therapy on two difference devices?

**You can copy a light treatment even if you have a different device. Your device must have a similar wavelength (color light). Add or subtract time per session to balance out differences in device power.**

**To copy a light dose, you need to know:**

**the joules of light transferred****the wavelength used**

If your device is more powerful, you need less time to get the same joules. If your device is less powerful, you need more time per treatment to get the same joules. The wavelength in your device can be close to the device you’re copying. It doesn’t have to be exactly the same wavelength.

This is Part I of a 3 part series.

- Part 2 shows how to translate a successful anti-aging study to the GembaRed SAIDI device. View that article here (opens in a new window): How to Copy Successful Light Studies with Your Device
- Part 3 takes the joules and wavelengths from several successful studies, and translates them to a few different devices. If you own one of these devices, you can look up the treatment time in the table to emulate that study. View that article here (opens in new window): Done For You: How to Copy a Light Therapy Study

## Disclaimer

I am not a doctor. This is not medical advice. I researched this information for my own use. I am now happily sharing it with you. I am not responsible for what you do with this information.

## Free Treatment Time Calculator

If you know:

- the power density of your device
- the joules of energy you want per session

Then you can use the EMF Channel Free “Treatment Time Calculator” (opens on this site in a new window) to calculate your treatment time in seconds.

It will give you the time per session required to transfer your target quantity joules from your device.

## Step 1: Use a Device with a Similar Wavelength

You can copy your friend’s treatment protocol using a different lamp than she uses. You do not need to have exactly the same wavelengths as she uses. The closer it is, the better.

Just based on popular RLT specifications, she probably has a device that outputs a wavelength in the 600 nanometers, and one in the 800 nanometers.

For example, if her device outputs 635 nm red, then your device should output 620 nm to 650 nm red. If her device outputs 850 nm infrared, then you want to use a device that outputs 835 nm to 865 nm infrared.

There are peak absorption wavelengths, but the healing happens within a range near that peak.

The farther the wavelength is from your friend’s device output, the less accurate your copy will be.

## Step 2: Make Sure You Get the Right Dose Info

A dose is a certain number of joules of a particular wavelength. A red light therapy (RLT) dose looks like this:

- the wavelength(s)
- the light energy transferred to the body measured in joules

A useful answer from your friend might be: “I dose with 15 joules of 660 nm and 850 nm wavelengths once per day.” Using this info, we can copy her protocol to your red light therapy device.

If she offers you an answer like the one below, then you will need to ask more questions to move forward.

- “I use the device every day”
- “Each session is 5 minutes”

Here, she gives you session information, but not joules and wavelengths. You can ask her simple questions about her protocol to get the information you need.

### Ask Simple Questions to Get Dose Variables

If you can get the answers to some simple questions, you can calculate her rosacea protocol.

**These are the questions to ask:**

**What wavelength(s) do you use?****How far is the device from your face (in inches)?****What is the device’s power density at that distance?****How long is each session in minutes or seconds?****How often do you treat?**

If she cannot answer about distance, session time, or session frequency, it might be time to move on.

These are simple questions with simple answers. Some people do not pay attention to details like this, though.

If your rosacea friend does not know wavelengths, time, or frequency, we should find another successful dose to copy. Most likely, though, she can answer everything but the power density.

**If she has everything but the power density, then ask her:**

**“May I please have a link to your device?”**

So long as the vendor’s website carries the information we need, we can calculate her dose.

### Red Light Dose Parameter Summary

The friend has answered the questions about:

- wavelengths
- treatment time
- treatment frequency
- distance from her device during treatment

For the sake of this example, here are her answers:

**wavelengths:**660 nm and 880 nm simultaneously**distance in inches from her face:**6 inches**power density at 6 inches:**she does not know, so she gives you a link to the vendor’s website page for her device**each session in seconds:**300 (5 minutes)**treatment frequency:**1 session/day/every day

In the next section, we will use a link to the vendor’s website to get the power density answer.

## Step 3: Get the Original Device’s Power Density

We need the power density of her device. This value changes with the distance she is from her device. The power density tells us the rate at which the energy flows from her device to her face.

Go to the vendor’s web page for her device.

**Search for the “output power,” “power density,” or “irradiance” list for this device on that website.**

The information you are looking for will look more or less like the following.

**[Your Friend’s Device Page]
Power Densities at Sample Distances**

- 100 mW/cm^2 at 0 inches
- 80 mW/cm^2 at 6 inches
- 73 mW/cm^2 at 12 inches

At what distance does your friend use her device?

- wavelengths: 660 nm and 880 nm simultaneously
**distance in inches from her face: 6 inches**- power density at 6 inches: she does not know, so she gives you a link to the vendor’s website page for her device
- each session in seconds: 300 (5 minutes)
- treatment frequency: 1 session/day/every day

**What is the power density at 6 inches for her device?**

- 100 mW/cm^2 at 0 inches
**80 mW/cm^2 at 6 inches**- 73 mW/cm^2 at 12 inches

**The power density in her protocol is 80 mW/cm^2 at 6 inches**

## Step 4: Calculate the Treatment Joules in Your Friend’s Protocol

You now have the data you need about your friend’s rosacea treatment to calculate her dose.

You have:

**wavelengths:**660 nm and 880 nm simultaneously**distance in inches from her face:**6 inches**power density at 6 inches:**80 mW/cm^2 at 6 inches**each session in seconds:**300 (5 minutes)**treatment frequency:**1 session/day/every day

We will now use this information to calculate the joules of energy transferred to her face each session.

## Step 5: Calculate Your Friend’s Joules per Session

The joule is a measure of how much photon energy the skin takes in from the light over time.

**The joules formula is:**

**Joules = ( Power Density x Time in Seconds ) / 1000**

### Your Friend’s Device’s Power Density

Your friend uses the device at **6 inches distance**.

The **power density** of that device is **80 mW/cm^2 at 6 inches**.

Therefore, the **power density is 80** (from the 80 mW/cm^2 @ 6 inches).

### Your Friend’s Treatment Time in Seconds

Your friend uses the device for 5 minutes per session. We need the time in seconds, so we multiply by 60. **The treatment time in seconds is 300.**

**Calculate joules from the power density and time:**

**( 80 x 300 ) / 1000 = 24 J**

Where:

- 80 is your friend’s device’s power density at 6 inches
- 300 is your friend’s treatment time per session in seconds

**( 80 power density x 300 seconds ) / 1000 = 24 J**

**Her dose is 24 joules at the wavelength(s) specified.**

Next, we will configure your treatment protocol with your device to deliver 24 joules.

## Step 6: Configure Your Rosacea Protocol

**The treatment dose we are copying is 24 J at the wavelength(s) specified.**

- We will get your device’s power density from the vendor website.
- Then we will pick a distance you will be from your device, because distance affects the amount of energy you receive.
- Then we will calculate how long to sit in front of that device each session to get 24 J of energy.

### Pick a Distance Between You and Your Device

What is the distance that you want to use your device?

If it is closer, your treatment will be faster.

If the device is too close for convenience, then you can push it away, and take your time.

For this example, we will say that you want a 12-inch distance between your device and your face.

**The distance between you and your RLT device is 12 inches.**

### Get Your Device’s Power Density

Go to your device vendor’s website.

Look for list of power outputs for your specific RLT device.

**[Your Device Page]
Power Densities at Sample Distances**

- 50 mW/cm^2 at 0 inches
- 30 mW/cm^2 at 6 inches
**13 mW/cm^2 at 12 inches**

At what distance will your lamp be from you? 12 inches.

What is the 12-inch power density for your device? 13 mW/cm^2 at 12 inches

**Your Treatment Power Density is 13 mW/cm^2 at 12 inches**

### Calculate Treatment Time from Power Density and Target Joules

**The treatment time calculation is as follows:**

**Time in seconds = (joules / power density ) x 1000**

Your goal is to get 24 joules per session. Enter “24” in the joules variable.

You chose a 12 inch distance. The power density at 12 inches is 13 mW/cm^2. Enter “13” into the power density variable.

**Calculate your treatment time in seconds:**

**( 24 / 13 ) x 1000 = 1846**

**Where:**

**24 is joules****13 is power density****1846 is the result in seconds****divide result by 60 to get minutes: 30.76 minutes**

**( 24 joules / 13 power density ) x 1000 = 1846 seconds**

**1846 seconds / 60 s per minute = 30.76 minutes**

**Your treatment time is 31 minutes.**

## Exercises

Use these exercises to solidify your understanding.

The Joules Calculation exercises give you the power density and time per treatment. You calculate the joules per session.

The Time Calculation exercises give you the power density and the joules per treatment. You calculate the time per treatment in seconds.

### Example Joules Calculation 1

The treatment we want to copy includes these parameters:

**Power Density: 100 mW/cm^2 at 6 inches****Treatment Time: 60 seconds**

What is the dose in joules?

**The joules formula is:**

**joules = ( power density x time in seconds ) / 1000**

**Using these parameters, the treatment time in seconds is:**

**( 100 x 60 ) / 1000 = 6 J**

Where:

- 100 is mW/cm^2 @ 6 inches
- 60 is time in seconds

**( 100 power density x 60 seconds ) / 1000 = 6 joules**

**The dose is 6 joules.**

### Example Joules Calculation 2

The treatment to copy includes these parameters:

**Power Density: 80 mW/cm^2 at 12 inches****Treatment Time: 10 minutes**

What is the dose in joules?

**The joules formula is:**

**joules = ( power density x time in seconds ) / 1000**

The time in seconds is:

**time in seconds = ( time in minutes x 60 )**

**Using these parameters, the treatment time in seconds is:**

( 80 x ( 10 x 60 ) ) / 1000 = 48 J

Where:

- 80 is 80 mW/cm^2 @ 12 inches
- 10 is 10 minutes
- 60 is 60 seconds per minute

**( 80 power density x ( 10 min. x 60 sec per min) ) / 1000 = 48 joules**

**The treatment dose is 48 joules.**

### Example Dose Time Calculation 1

You have the target joules from your friend’s treatment parameters.

Using your device at the distance given below, how long should each of your sessions be in seconds?

**Dose Joules: 6****Power Density: 100 mW/cm^2 at 6 inches**

What is the treatment time in seconds sitting 6 inches from the device?

**The time per treatment in seconds formula is:**

**time in seconds = ( joules / power density ) x 1000**

**Using the given parameters, the treatment time in seconds is:**

**( 6 / 100 ) x 1000 = 60**

Where:

- 6 is the dosage energy target in joules
- 100 is the lamp power density of 100 mW/cm^2 at 6 inches

**( 6 joules / 100 power density) x 1000 = 60 seconds**

**The treatment time is 60 seconds.**

### Example Dose Time Calculation 2

You have the target joules from your friend’s treatment parameters.

Using your device at the distance given below, how long should each of your sessions be in seconds?

**Joules: 48****Power Density: 80 mW/cm^2 at 12 inches**

What is the treatment time in seconds sitting 12 inches from the device?

**The time per treatment in seconds formula is:**

**time in seconds = ( joules / power density ) x 1000**

**Using the given parameters, the treatment time in seconds is:**

**( 48 / 80 ) x 1000 = 600**

Where:

- 48 is the energy target dose in joules
- 80 is the lamp power density of 80 mW/cm^2 at 12 inches

**( 48 joules / 80 power density ) x 1000 = 600 seconds**

**The calculated treatment time is 600 seconds**

## People Also Ask

**What should I do if I think the vendor has overstated the RLT device power?**

RLT is competitive. Vendors know that people assume that “more I better.” This leads to overstating how powerful RLT devices are.

I had a vendor tell me a device power output was 2 watts. When I questioned how it could be so high, I found out that this was the device’s input power from the electrical wall socket.

**The input power value is irrelevant to your dose. **You care about the power coming from the LEDs to your body, not the power coming from the wall into the device.

Biohackers testing consumer devices have found that actual power densities are as little as 40% of the values stated in marketing literature.

Measuring light is a tricky business. It is not an easy task to calibrate a meter to measure light power.

Overcome the problem with a scientific approach to your dosing. If the treatment area is on the skin, take a picture of it before treatment each day. Use a journal to measure pain changes. Be as objective as one can be about whether your current RLT dose is working.

If it is working, then stick with it. If not, increase treatment time. Record your treatment time change, and keep recording your status.

For example, you might increase your treatment time by 2 minutes per session.

Mark the date in your journal when you do this.

Take photos of skin changes. Jounal your pain each day on a scale of 1 to 10.

Going slowly helps keep you in a therapeutic range.

An overdose is a complete waste of time, and can be harmful.