The visible red lasers tend to penetrate the skins surface less if lower wattage unless it is designed to reflect less. Lower powered lasers are good for surface issues (skin issues, muscles just under the skin, etc.). Infrared lasers penetrate deeper and can reach the deep muscles as well as hitting the superficial areas at the same time. The infrared lasers do not have the reflection concerns that a visable laser has.

For hair loss the standard in the industry for wavelengths is around 650 nm (nanometers). There is a compromise in the middle where it is still has enough power to travel deep to stimulate the hair follicles and enough depth to travel further. Different wavelengths can penetrate more or less and have more or less reflection which can go against stimulating the hair cells. Infrared lasers are not as good as the visable lasers for hair follicles but they serve their purpose in other areas of the market. Lasers that are over 650 nm tend to be reflected more by the blood and are not as bright. This is why most hair lasers are moving toward 650 nm after trial and error over the last few years. They are finally getting it right.
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