What tests were performed to determine the 98% of UV blocked?
933200
I don't know..I just bought a pair months ago. I have not used them because I have small hands and they were too big for me and they covered my nails.
188462
Perhaps test it on a similar piece of cloth to see the results. even an untreated cloth would yield results to compare.
2126363
20% light letting through.To give you a reference 5% is whats on a limosine.
1638870
Annually or earlier if it is placed first in lime which it should not be. Trust the engineers that designed it. If it is placed first the UV chamber will become coated with impurities in the water thus blocking the UV light from working.
2172504
YES, please see product info, TESTED AND CERTIFIED - Certifications available upon request. Testing was conducted for removal of the following contaminants: Endrin, DDD, DDT, Lindane, Heptachlor, PCB's, Altrazine, Simazine, Nitrite, Bromodichloromethane, Bromoform, Benzene, Dibromochloromethae, Carbon Tetrachloride, Ethyl Benzene, Methyl Tert Butyl Ether, Trichloroethane, Toluene, Xylene, Giardia, Crytoporidium, E. Coli, E. Faecalis, F+RNA. Testing shows 99.9999% Reduction of Bacteria, Cysts & Viruses. The Advanced Personal Filter Straw was also tested for removal of Chlorine (99.58%) and Heavy Metals including Aluminum, Arsenic, Cadmium, Copper Lead & Mercury (97.5%). Finally the Advanced Personal Filter Straw was tested for removal of Iodine (91.67%).
385375
My thought was yes. UVC is a short wavelength and that is why it is blocked by our atmosphere. So it is easily blocked by glasses and probably plastic as well, especially plastic that we know blocks UVA and UVB rays. Here something from Wikipedia: Ordinary glass is partially transparent to UVA but is opaque to shorter wavelengths, whereas silica or quartz glass, depending on quality, can be transparent even to vacuum UV wavelengths. Ordinary window glass passes about 90% of the light above 350 nm, but blocks over 90% of the light below 300 nm.So with resonable confidence yes they block UVC, which is what germicidal lamps put out. Watch out for your exposed skin though. My thought was yes. UVC is a short wavelength and that is why it is blocked by our atmosphere. So it is easily blocked by glasses and probably plastic as well, especially plastic that we know blocks UVA and UVB rays. Here something from Wikipedia: Ordinary glass is partially transparent to UVA but is opaque to shorter wavelengths, whereas silica or quartz glass, depending on quality, can be transparent even to vacuum UV wavelengths. Ordinary window glass passes about 90% of the light above 350 nm, but blocks over 90% of the light below 300 nm.So with resonable confidence yes... » Read More My thought was yes. UVC is a short wavelength and that is why it is blocked by our atmosphere. So it is easily blocked by glasses and probably plastic as well, especially plastic that we know blocks UVA and UVB rays. Here something from Wikipedia: Ordinary glass is partially transparent to UVA but is opaque to shorter wavelengths, whereas silica or quartz glass, depending on quality, can be transparent even to vacuum UV wavelengths. Ordinary window glass passes about 90% of the light above 350 nm, but blocks over 90% of the light below 300 nm.So with resonable confidence yes they block UVC, which is what germicidal lamps put out. Watch out for your exposed skin though. « Show Less
542303
I'm not sure if they block all UV and Blue rays, but they are awesome especially for the price. I look at a computer screen at work constantly and when my eyes start to hurt, I put them on and it really helps. They are nice looking too.
199714
The issue is UV light. https://www.macular.org/ultra-violet-and-blue-light quotes 400nm as the cut off.
1887891
Doesn't claim to block UV rays. I don't think that it has UV rays. It is a short blue light wavelength and is used for seasonal affective disorder or (SAD). People who get depressed or have less energy during the winter months when there is less sunlight often use these to decrease the SAD symptoms. I use it in the winter months and like it a lot.
502731
I will say 99.9% of the sun's rays are block. We have complete shade. I have never gotten sunburn under the shade sail.
255415
It defuses the sun light. No squinting. Suppose to help with uv. You do not feel direct sun het. I like the product. Not easy to install.
1808
It appears to have a UPH rating of 50, which equates to blocking approximately 97.5% of UV rays. http://babybeachtents.net/genji-sports-pop-up-family-beach-tent-and-sun-shelter-review
952956
The lamp is not "full spectrum" as that would include the UV light, which with this unit is 99.3% filtered. The color temperature, lux level reaching the eye and the positioning of the lamp above the view plane are the more critical components based on expert guidelines. Before considering any bright light therapy product, consult with your physicain to ensure it is appropriate for your individual needs.
441338
The formula is SPF 32. The bullet points contained a typo. FDA changed the OTC monograph in 2011, enforceable in 2012, and we had to have all the formulas retested under it, instead of the 1999 monograph, which while never enforced was still the proper way to test sunscreens. The formulas tested a bit higher under the 2011 monograph, but inconsequentially; the difference in protection between SPF 20 and 32 is about 2% (95% vs 97%) given the non-linear mathematics of SPF and UV protection. The formula is labeled correctly at SPF 32.
1654734
Not sure about percentage but some sun does shine through. Not enough to get sunburned though. Hope this helps.
1343329
I have no idea if they will block UV...Asking the wrong guy this time, sorry.....
869030
Takes a standard 77mm UV filter. Not sure if it creeps into the image. I can check.