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Ellipsoidal Reflector Spotlight - ERS is an acronym standing for Ellipsoidal Reflector Spotlight. These are sometimes known by their brand names, especially Leko, short for Lekolite, the name given to them by their inventors, Joseph L. Used . evy and Edward Kook. ETC's Source Four has become a very popular ERS throughout the industry, and some people use the term Source Four to refer to spotlights in general. They come in many for. Used . ms, and are the most numerous and important instrument type in use. The flexibility of the ERS allows them to fulfill the bulk of the lighting roles in the theatre, from area lighting to close specials, from l...

Followspot - Followspot is a generic term used to describe any number of lighting instruments used to highlight performers on stage. A followspot operator moves the followspot to follow the performer or to accent. Used . some action or prop etc. Somtimes called limes, dating back to the days of limelight.

Followspots are generally much brighter than conventional lighting instruments, and often u. Used . se a lamp with a considerably higher color temperature.

Depth of Field - While a lens focuses on a single plane of depth, there is usually an additional area in focus behind and in front of that plane. This is depth of field. Depth of field increases as the iris is closed.. Used . There is more depth of field the wider the lens and le . Used . ...

Triangular - A triangular truss is so named because of its triangular shape, having three main support bars.. Used . . Used . ...

Ballyhoo - A set of programmed moves for automated lights where the lights move randomly within a specific area.. Used . . Used . ...