We have all heard of ultraviolet light bulbs, but very few people understand what ultraviolet means. Ultraviolet is not visible to the human eye and many people don’t know this, but UV is radiation. Light is measured in nanometers and UV light (ultraviolet light) has 3 different nanometer measuring. UV-A is measured from 320 nm to 400 nm. UV-B is measured from 280 nm to 320 nm and UV-C is from 100 nm to 280 nm.

Of the three types of ultraviolet lighting UV-C is a proven form of sanitation. Also known as Germicidal Irradiation, UV-C is used to purify air, water, and surfaces. These types of ultraviolet lamps kill germs, and such bacteria as fungi, mold and spores. It also kills allergy causing elements and germs that trigger asthma. These UV bulbs are able to do this because of their short wavelength. The UV-C penetrates the outer membrane layer of bacteria, viruses, etc. After the UV-C penetrates the membrane it attacks the target DNA and breaks the chain between the two helixes, ultimately leaving the germ or bacteria dead.

UV-B is similar to the ultraviolet light that the sun emits. Class B ultraviolet bulbs can be found in tanning salons. However UV-B can cause some health issues if exposed to it for a long time. Be careful not to be exposed to class-B ultraviolet lamps.

Class-A ultraviolet lights are commonly known as black or blue lights. Its nanometer rating lays between 315 nm to 400nm. This ultraviolet lighting is generally none harmful. It’s a reasonable source for tanning though it’ll take a much longer time to achieve wanted results.