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Reference.org
Large-format slide projector
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<p>A large-format slide projector (also often called large-format projector or large-image projector) is a kind of <a href="/facts/Slide_projector/b2N84a91">slide projector</a> for large image projection which has a very powerful <a href="/facts/Light_source/jeofpMn4">light source</a> (up to 12 thousand watts using <a href="/facts/Arc_lamps/1y99ep6E">arc lamps</a>). The light source generates a lot of heat even when filtered to only visible light; the projected transparency is protected from overheating by the heat being distributed across its large area, and cooling fans. Slide formats include 18 × 18 cm (7.1 × 7.1") or 24 × 24 cm (9.4 × 9.4"). </p>