There are some fairly strict rules on the amount of UV radiation that is allowed; but the amount of UV is unmeasurable in CRTs for the reasons above.
Os LCDs CCFL não emitem uma quantidade mensurável de UV, e as lâmpadas CCFL são protegidas para evitar possíveis emissões. Os LCDs LED emitem ainda menos do que o CCFL (possivelmente nenhum , dependendo do tipo de luz de fundo do LED e da técnica de construção individual do LED).
The XP Society attempted to measure UV that might be radiated from LCD screens. They were unable to detect any UVA or UVB using meters capable of measuring as low as 1 microwatt per square centimeter in the UVA and UVB spectrum.
Fonte: Sociedade Xeroderma Pigmentosum, Inc.
...if any company sells a large UV protection plastic...
Basicamente não existe tal coisa, como todos os blocos de plástico UV. Mesmo os não-coloridos:
The plain fact is that plastics are not very transparent to UV light... Some plastics will pass some near UV, ie. close to 330 nm, but UVA, B and C will not pass. Tinting may not affect the UV transparency, but clear plastic blocks UV just a good as green plastic. My clear prescription glasses, plastic, block UV light as good as dark sunglasses.
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For fun we would take the light sensors outside and measure the UV blocking of expensive vs cheap sunglasses using students hanging on the "concrete beach" at the student centre. Many students, were kind of angry to find out that $5 plastic glasses blocked as much UV A/B as $300 designer glasses from those fancy shops in the upscale malls.