Many clinicians ask us: What is the difference between Class 3 and Class 4 Lasers? There is a slew of false information in the public domain, perpetuated mainly by the manufacturers of these devices, regarding the effectiveness and cellular mechanisms activated during class 4 laser light irradiation. Many class 4 laser manufacturers are intentionally or unintentionally misleading healthcare practitioners into believing that higher power and longer NIR wavelengths equate to deeper tissue penetration and better clinical efficacy. Nothing could be further from the truth. The truth is… Unfortunately, all of these claims turn out to be fancy sales gimmicks, as they have not the standing in the clinical or scientific journals to support their claims. The clinical and scientific facts are clear that because of the very high absorption of NIR laser light by water at wavelengths greater than 950 nm, 99% of the energy produced at this wavelength or … Read More