The light emitted by a 635nm device, regardless of whether the source is laser-based or LED-based, will deliver the same reaction within the tissue. This has been proven in a study done by a physician that indicated both types of light, laser and LED, became diffused upon entering the dermis. The light was diffused to the point where there was no negligible difference between the two types of light when it reached the subcutaneous fat cells (fat cells below the surface of the skin).