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Lighting/Enclosures
Mirrored Reflector Behind UVB
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[QUOTE="kingofnobbys, post: 1922115, member: 81934"] The increase you are seeing is the optical effect of the UV that would otherwise be lost being reflected and concentrated by the "mirrored" reflector surface. Added as afterthought to show how it works to concentrate "light" : [img]https://i.postimg.cc/vmcSX83T/concentrating-effect-of-a-parabolic-reflector-on-incident-light.png[/img] Very same principle but in reverse as used in parabolic solar collectors (using parabolic shaped reflector troughs). ref Duffie, J.A. Beckman, W., Solar Engineering of Thermal Processes, Chapter 7: the introduction through Section 7.10. pp. 354-358. Simply put , no reflector , less than 1/3 or 1/4 the UV emitted from the UV source is directed at the basking reptile, add a parabolic reflector and if it's got a good UV reflective surface then intensity of the UV flux received by the basking reptile is increased by the reflector directing otherwise wasted UV towards the reptile ( the effect is additive and highly sensitive to the surfaces reflectivity ) . See the links already provided. Regards Al foil , depending on it's end purpose , it's rolled with different tempers in thicknesses between 5 microns and 200 microns. The tolerance ( Perry's Chem Eng HB ) is +/- 8% in gauge (thickness), for 5 micron foil (like you probably have in the pantry) , the tolerance is 400 nm ( not bad for visible light , not so flash for UV ). CeO nanopowder has a particle size of 50 to 80 nm , this is commonly used in producing precision optical surfaces ( lens faces and mirrors , and in metallography ). Now a little physics : for good reflection , the rule is one half wavelength is the minimum tolerance for a good surface , so for UV at 200 nm , the aim is 100 nm surface roughness , aim used where wavefront distortion is not as important as cost ( as in the case of reflector hood ). [/QUOTE]
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Lighting/Enclosures
Mirrored Reflector Behind UVB
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