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UV light - a natural paradox; UV-B is harmful, but cures psoriasis; UV-A is less harmful than UV-B; Recommending my-tronic's products

Controllable LED light sources can be used for scientifically purposes, not only for decorating and illuminating buildings. Some LEDs are perfect for growing plants and others for healing. UV LEDs can help doctors heal psoriasis and other skin problems. UV LED as a source has not been widely recognized, but the general advantages LEDs have recommend UV LED light sources as perfect tools in a wide application area, not only for healing psoriasis.

UV light - a natural paradox

Far from being harmless, UV light is still helpful. This is probably a paradox, but fact is that UV light helps in many application areas more and more today. From curing epoxy to therapeutic purpose, UV light has proven that used properly, can be an effective tool. One general look at the application area is still not enough, for there are different kinds of UV light, each with its proprieties and functionalities.

The UV radiation wavelengths coming from the Sun start (approximately) from 100 nm and end at 405nm, but what reaches the Earth has wavelengths that vary between 280 and 400 nm (nanometers). According to the wavelength range, three kinds of UV light were determined. UV-C (100-280 nm) is almost completely absorbed in the air within a few hundred meters, so none of it can reach the Earth. Things change when it comes to UV-B and UV-A. UV-C although is the most dangerous of the three, it is used for air purifying and water decontamination as it kills germs and bacteria.

UV-B is harmful, but cures psoriasis

UV-B was often considered the most destructive form of UV light, but it is used to cure psoriasis, as you will read later. Although it represents only a small portion of the spectrum (280-315 nm), UV-B causes damage at the molecular level of the deoxyribonucleic acid - DNA. Ultraviolet photons harm living organisms in different ways, however cells have developed the ability to repair DNA. Still sometimes the repair is impossible. Skin cancer is only one of the examples showing how harmful UV-B can be. This particular light affects also the biosphere, yet it is not only the UV-B itself causing changes, but also the lack of water and other important nutritive substances. It is a fact that UV-B light affects species differently. Plants overexposed to UV-B light will reduce size and be more susceptible to specific diseases. This will also affect the animals and other living organisms depending on these plants.

Psoriasis is the most common disease treated with UV-B alone or in combination with medicine. A well-known form of treatment is the Goeckerman regimen, combining UV-B light with coal tar applied to the affected skin. Sometimes patients are given systemic agents such as methotrexate and retinoids (vitamin A derivates).

Generally psoriasis shows significant improvement after three to five UV-B exposures a week, for about four to five weeks. It is always recommended to do such a treatment under the direct supervision of trained staff. Physicians will first expose to UV-B only a small part of the patient's skin, in order to find out the least erythema dose, the minimum amount of UV-B that generates redness 24 hours after exposure. This medical treatment is also known as phototherapy and it may be also used for other skin conditions such as eczema, lymphoma, pruritis, atopic dermatitis and so on. Yet the treatment is not suitable for all forms of psoriasis and eczema, and in some cases it may even aggravate the disease.

UV-A is less harmful than UV-B

Humans need UV-A for the synthesis of vitamin D, but too much may also lead to cataract formation. In other words, UV-A is less harmful that UV-B, but it still can contribute to the premature aging of the skin, DNA damage and skin cancer. UV-A doesn't cause sunburn, as it penetrates deeply and it doesn't produce erythema. It is also known that 99% of the UV light reaching the Earth is UV-A. This kind of light is know as "black-light" as it is invisible to human eye. As UV-B, UV-A is also used to treat psoriasis. The method is called PUVA and it combines psoralen (a drug) and ultraviolet-A. Adverse effects of PUVA include nausea and itches. Long-term complications can include sensitivity to the sun, cataracts, skin cancer and so on.

Recommending my-tronic's products:

UV light coming straight from the Sun cannot be used in laboratories. UV lamps were developed to fit different requirements. UV-A, UV-B and UV-C LEDs are available on the market in different wavelengths UV-A: 400 nm, 395 nm, 385 nm, 375 nm, and 365 nm, and recently UV-B 290 nm and UV-C 275 nm. As smaller areas of the skin are sometimes treated with hand-held devices UV LED lamps can be very effective.

My-tronic is offering custom specific solutions. This way users can be sure that, if they cannot find on the market a product that respects exactly the technical features they require, if possible, the company develops a new item. There are hundreds possibilities and applications for LEDs in general and UV LEDs in particular. Replacing expensive UV traditional lamps with UV LED light sources can be a good solution for the future as LEDs' life span is wider and they do come in different wavelengths and viewing angles. My-tronic's UV LED light sources can come in any shape and size and users can control the brightness level decreasing this way the risk of premature aging of the skin or more dangerous side effects (severe burns or skin cancer).

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Mihaela Lica
MY-TRONIC GMBH
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