For deeper tissue benefits and targetted work, you can get a little closer. It is recommended to be 10-20cm from the device for a treatment time of 5-10 minutes. This allows the light photons to penetrate deeper and reach some of your muscles and organs, allowing the beneficial healing power of red light to take it's effect. Remember, the closer you are to the light, the higher the intensity. Therefore applying Mercola's formula you will need less time in front of the light to achive the required amount of energy from it.
Whatever goal you are targeting, you will still receive all the other benefits to do with red light therapy during your treatment (see our blog post on Which Wavelengths Work).
You should also feel the gentle warming effect on your body which is natural as red and near-infrared light improves blood circulation and mitochondrial energy and efficiency.
Don’t worry though, the lights never get hot enough to burn you or damage your skin.