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2. Plastic headlight restoration - Wikipedia

   en.wikipedia.org/wiki/Plastic_headlight_restoration

   There are many "do it yourself" headlight restoration kits available for purchase. A few of the major brands that produce these kits include 3M, Turtle Wax, Sylvania, Rain-X,and Rust-Oleum. Most of these kits require multiple stages of wet sanding to remove the oxidation of the headlight lens, usually with descending level of grit (coarse to fine).

3. Headlamp - Wikipedia

   en.wikipedia.org/wiki/Headlamp

   Sanding or aggressively polishing the lenses, or plastic headlight restoration, can buy some time, but doing so removes the protective coating from the lens, which when so stripped will deteriorate faster and more severely. Kits for a quality repair are available that allow the lens to be polished with progressively finer abrasives, and then be ...

4. High-intensity discharge lamp - Wikipedia

   en.wikipedia.org/wiki/High-intensity_discharge_lamp

   High-intensity discharge lamps (HID lamps) are a type of electrical gas-discharge lamp which produces light by means of an electric arc between tungsten electrodes housed inside a translucent or transparent fused quartz or fused alumina arc tube. [1] This tube is filled with noble gas and often also contains suitable metal or metal salts.

5. Fresnel lens - Wikipedia

   en.wikipedia.org/wiki/Fresnel_lens

   A Fresnel lens (/ ˈ f r eɪ n ɛ l,-n əl / FRAY-nel, -⁠nəl; / ˈ f r ɛ n ɛ l,-əl / FREN-el, -⁠əl; or / f r eɪ ˈ n ɛ l / fray-NEL [1]) is a type of composite compact lens which reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections.

6. MovieLens - Wikipedia

   en.wikipedia.org/wiki/MovieLens

   MovieLens is a web-based recommender system and virtual community that recommends movies for its users to watch, based on their film preferences using collaborative filtering of members' movie ratings and movie reviews. It contains about 11 million ratings for about 8500 movies. [1]