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Why the Leimo There are many other personal-use home handheld laser comb devices. There are a basic fundamental similarity but also many differences. The fundamental similarity is that all such devices are Low Level Laser Therapy devices designed for home use, so all such devices are designed and build to be safe and user friendly. On the other hand there are a few differences - so what are the main differences between the Leimo laser hair comb and other personal home handheld laser comb devices? Differences in wavelength - Leimo 890nm One major differences between the Leimo and some other laser hair devices is in the wavelength. The laser wavelength of the Leimo is at 890nm, which is near infrared. On the other hand many other similar laser hair devices uses wavelength in the visible red spectrum - somewhere from 630nm to 700nm. 890nm better than 630 - 700nm? Infrared or Visible Red? Do note that both visible red and infrared light have been shown to effect at least 24 different positive changes at the cellular level.
Visible red light, at a wavelength of 660 nanometers penetrates tissue to a depth of about 8-10mm.
Infrared light at 890nm penetrates to a depth of about 30-40 mm. Dose this means that an invisible Infrared light is better than Visible Red light ? The answer is NO. Although both red and infrared wavelengths penetrate to different depths and affect tissues differently, their therapeutic effects are similar. Depth of penetration is defined as the depth at which 60% of the light is absorbed by the tissue, while 40% of the light will continue to be absorbed. However in our design of a home use therapeutic laser (Leimo) our researchers are of the opinion that deeper penetration will not only effect better hair cells growth but also enhances better blood circulation and cellular metabolism hence an faster increase in hair cell density. Depth of Penetration - Different Physiological Effect It have been shown that different wavelength of light have different effect (Young 1989, EL Sayed 1990, Young 1990). Over the past 10 years trials have shown that different wavelength have different physiological effect. The basic general guideline is that the higher the wavelength the deeper the penetration.
At this point of time we are of the opinion that no one company can conclude absolutely that lower wavelength RED lasers are certainly better than an infrared high wavelength lasers for hair and scalp therapy, and vice versa, without any systematic clinical research. What we did was to conduct our own clinical trial using 890nm on mice hair growth , and it seems that the results are satisfactory. ( see clinical studies ) Similarly , Satino and others [1] performed a LLLT test with a red 630nm device at 4.5mW power output, on 35 patients with androgen alopecia (28 men and 7 women) in 2003 and also reported satisfactory results. In 1984, Dr. Trelles showed in one study that patients with alopecia areata who were treated with He-Ne laser 632.8 nm showed a good response. In 1996 Professor Pekka J. Pöntinen established established the beneficial effect of laser therapy on hair and scalp showing an increase in blood flow by 54%, using a device at 670 nm. However we must acknowledge that devices used by Dr. Trelles and Professor Pöntinen are professional laser therapy devices of a higher power density output. The basic general guideline is also that the higher the power output the deeper the penetration level. For example , a laser with wavelength of 850nm , power output of 200mW will have a deeper penetration level than a laser with wavelength of 850nm but with a power output of just 50mW. Hence devices used by both Dr. Trelles and Professor Pöntinen although are at Red visible wavelength should afford a deeper penetration liken to an infrared device. The Leimo is designed for personal home use designed as a very low power output laser device. This lack of power density are off-set by the use of higher wavelength at 890nm.
In conclusion, all researchers acknowledge the fact that hair started to grow on the laser-irradiated area does only indicate the relevance between low powered laser irradiation and the stimulation of hair growth. These trials can only provides the suggestion of the possibility of the use of lasers to treat hair loss. Indeed further research are still needed to find the effect of low-powered laser treatment on human hair growth and how the laser stimulates hair growth. In short we need to find out the biological and physiological effect of laser irradiation on hair and hair cells. Hence we cannot conclude that Red visible wavelength is better than 890nm or vice versa. What we did was to combine both LED Red 650nm and Infra 890nm to give users the best of both world - Lower wavelength of RED LED and higher wavelength of 890nm lasers. We also offer a chance for users to try and a chance to return after 90 days if results are not satisfactory.
[1] Satino JL, Markou M. Hair regrowth and increased hair tensile strength using the HairMax LaserComb for low-level laser therapy. Int J Cosm Aesth Dermatol 2003;5:113-117
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