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Ellipsodial Reflector ERS gets its name because it uses a Ellipsodial Reflector a section of an Ellispe and contains 2 focal points plano convex lenses the ERS optical system uses 2 S-4 a reinvented, re engineered, ERS the HPL 575w or 750w compact tungsten filament lamp lampis very efficient and produces an intense light from a very small area of the filament it contains a fresnel lens diameter that tells if its a 6" or 8" fresnels gets its name because the focus beam the fresnel uses is a spherical reflector that is mounted on the sliding tray expand fresnel (sliding the focus tray 2wards the lens cause the light beam to contract fresnel (sliding it back 2ward the reflector causes it to 500w, 750w meduim focus 6" fresnels can use 1000w, 1500w mogul pre focus 8" fresnel parbolic reflectors par 64 is called 8" the 64 in par means the lamp has a (blank) diameter s-4 par produces light similiar to par 64 lamp s4 rotate lens and not (blank) to focus s-4 par unlike (blank) the diff. between the reflector, lamp, and lens never changes fresnel s-4 parnel similiar to both s-4 par and fresnel like (blank) uses hpl 575w or 750w s-4 par uses parabolic and mulifaceted reflector like s-4 par like (blank) the parnel is designed to change the radius of the light beam. it does this by means of a patented wave lens system fresnel operator follows performer follow spots distance 30' to 100' short throw spot distance 100' to 250' long throw spot strip of lights 6x6 strip lights asymetric reflector to create a bright, smooth wash of even intensity that is meant to spread vertically cyc lights unlike the (blank blank) a cyc light needs distance to provide an even wash up and down the backdrop strip light meant to sit on ground ground cyc comes in 1 to 4 lamp configurations hanging cyc lights shutters are located near the center of the unit ers fresnel focus is on the (blank) of the unit bottom shows lighting positions labeled by their location sight line points a designers shorthand notation magic sheets section of stage floor which projects towards or into the auditorium apron