CITATION — REFERENCE ENTRY
ers-optics-and-history · controlbooth-wiki-ellipsoidal-reflector-spotlight
- Claim ID
- ers-optics-and-history
- Assertion
- An ellipsoidal reflector spotlight places the lamp at one focus of an elliptical mirror so that light is reflected through the other focus, where a gate with four framing shutters, an iris or gobos shape the beam. LekoLight, from the surnames of Joseph Levy and Edward Kook of Century Lighting, was a trademark in 1932; ETC introduced the Source Four in 1992; modern units are classed by beam angle (36, 26, 19, 10 and 5 degrees).
- Quote
By placing the lamp at one focus of an elliptically shaped mirror, all light leaving that lamp will be reflected through the other focus.
- Quote language
- en
- Locator
- section: Article body
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