UVA rays are typically considered safer in moderation than UVB rays. Outdoors, the strength of UVA rays is the same all year long. The have an energy per photon of 3.14-3.94 eV and are considered a long wave or black light wave.
http://tansafe.blogspot.com/2011/08/uva-vs-uvb-rays-why-tanning-beds-are.html
UVB Rays. UVB Rays are the rays you can blame when you get a sunburn. Unlike UVA rays, these rays aren't always the same strength year round-They're more prevalent in the summer months, however they are able to reflect off of water or snow, so it's always important to protect yourself year-round.
http://skincare.about.com/od/sunkissedglow/a/UVAandUVBRays.htm
The stratospheric ozone layer absorbs most of the harmful ultraviolet B (UVB) radiation (shortwave UV rays measuring 280-315 nanometers, or nm) emitted by the sun.
http://www.skincancer.org/prevention/uva-and-uvb
Understanding UVA and UVB. For a six billion-year-old star, the sun is certainly in the news a lot lately, mainly because it is still a source of uncertainty and confusion to many of us.The center of this confusion is the sun's ultraviolet A (long-wave) and ultraviolet B (shortwave) rays. Read More.
http://www.skincancer.org/prevention/uva-and-uvb
These parts are divided into UVA, UVB, and UVC wavelengths. UVA and UVB are the wavelengths reptiles need for survival. UVC, on the other hand, is a harmful carcinogen produced by direct sunlight. Ultraviolet lighting is key in the production of vitamin D3, which is necessary for calcium metabolism.
http://blog.petsolutions.com/reptile/lighting-for-your-reptile-the-importance-of-uva-and-uvb-radiation/
The rays that come from the sun, UVA and UVB rays, are well known to cause damage to our skin. From early aging all the way to skin cancer, there are many reasons to protect yourself from the sun's rays. But before you think you know enough just because you apply sunscreen, think again! Knowing the difference between UVA and UVB rays can help you pick out the best sunscreen for you and give you insight into just what each ray is responsible for.
http://skincare.about.com/od/sunkissedglow/a/UVAandUVBRays.htm
The difference between UVA and UVB is nanometer (measure of visible light) range of each. UVA is 320-400 nm and UVB is 290-320 nm. UVA slightly changes the way reptiles view their environment. These differences help in feeding and breeding. The way we see things may appear very different to them under UVA light. UVB is necessary for reptiles to produce vitamin D3 which allows them to metabolize calcium.
https://answers.yahoo.com/question/index?qid=20120424161337AAxZp5E
UVB rays are responsible for causing most skin cancers. While large doses of UVA rays can contribute to cancer, it's the UVB rays that are commonly to blame.
http://skincare.about.com/od/sunkissedglow/a/UVAandUVBRays.htm
This is the light range that is out of the human visible spectrum. 320nm to 400nm is UVA. 280nm to 320nm is UVB. Most regular light bulbs produce at least some UVA. UVB is what some lizards need to produce vitamin D and utilize calcium properly. No regular light of any type produces UVB, including most aquarium/coral lights and grow lights.
https://answers.yahoo.com/question/index?qid=20120424161337AAxZp5E
The difference between UVA and UVB is that UVA induces normal activities and needs throughout the day while UVB helps in the creation of Vitamin D3. The only lights that are safe and produce the two critical UV wavelengths, UVA and UVB, are fluorescent lights. Incandescent lights do not produce UVB radiation, so that type is not an option. Phototherapy, germicidal, stadium halides, mercury vapor, and tanning salon fluorescent tubes all produce UV radiation.
http://blog.petsolutions.com/reptile/lighting-for-your-reptile-the-importance-of-uva-and-uvb-radiation/
what is the difference between uva and uvb tanning bulbs
The difference between UVA and UVB tanning bulbs is that UVA induces normal activities and needs throughout the day while UVB helps in the creation of Vitamin D3. UVA induces normal activities and needs throughout the day while UVB helps in the creation of Vitamin D3.