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Lighting/Enclosures
Mirrored Reflector Behind UVB
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[QUOTE="kingofnobbys, post: 1922133, member: 81934"] Food grade aluminium foil is not treated to prevent surface corrosion ( formation of Al203 that starts immediately on exposure the air and immediately impacts the UV reflectivity). Foil is very delicate to work with ( as anyone who has used to wrap baked chunks of meat can attest. Foil will not hold the shape , so a substrate is needed to form to shape and the foil needs to be attached to this. FYI the reflectance of Al203 in UV is very poor. [img]https://i.postimg.cc/DZVxDXg8/reflectance-of-al2o3-in-uv.png[/img] ref Antireflective bilayer coatings based on Al2O3 film for UV region K.MARSZAŁEK, P.WINKOWSKI, M.MARSZAŁEK Materials Science-Poland, 33(1), 2015, pp. 6-10 This is why astronomical reflecting telescopes have "PROTECTED Al" as the reflective surface, the protection is provided by a thin optical layer of pure SiO2 ( which is transparent to UV ) and protects the vapor deposited optical film of pure aluminium from oxidation. I think the large gain in reflectivity is worth the little bit of extra effort. PLUS foil is exceedingly delicate to work with and very easy to damage , a polished sheet of aluminium is strong and there is a choice of tempers and alloys ( chemistries) , is very durable and will hold the bend to form the parabolic-like profile. Aluminium sheet comes in a choice of thickness between 0.5mm to 6.0mm for flat sheet and coil, A bottle of CeO slurry can be readily acquired from any hardware shop , any chop-shop will know all about it as it's commonly used to polish car panels before and after painting , and by stone masons , to that nice slick finish). So if a commercial reptile specific slip on reflector or reflector hood is not an option, and you must make your own , do it once , do it right . [/QUOTE]
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Lighting/Enclosures
Mirrored Reflector Behind UVB
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