apparent candlepower — Optics. a measure of the luminous intensity of an extended source of light in terms of the candlepower of a point source of light that has an equivalent luminous intensity when placed at the same distance as the extended source … Useful english dictionary
Lighting — Not to be confused with lightning. For other uses, see lighting (disambiguation). Low intensity lighting and haze in a concert hall allows laser effects to be visible … Wikipedia
John Levitow — Infobox Military Person name= Sgt. John L. LevitowUnited States Air Force born= birth date|1945|11|01 died= death date and age|2000|11|08|1945|11|01 placeofbirth= Hartford, Connecticut placeofdeath= Connecticut placeofburial= Arlington National… … Wikipedia
North American railroad signals — Main article: North American railway signaling Baltimore and Ohio Railroad Color Position Light bracket masts at Magnolia, West Virginia North American railroad signals generally fall into the category of multi headed electrically lit units… … Wikipedia