an average spot has a beam angle of three to seven degrees with some high end companies producing lights with zero degree beams. Such beam effects are less seen in the theatre industry and more in the club and concert industry. Debate Not all lights that have movement can be defined as intelligent. Basic, low cost fixtures that are marketed primarily to DJ's, club venues, or for retail in novelty stores are not controllable beyond simply powering the device on or off. This lack of a feature set or remote control makes these lights only a small step above a conventional stage lighting instruments. The introduction of devices referred to as "Auto-yokes", after the original design created by the company City Theatrical, blurs the line between a "conventional" and "intelligent" fixture. Designed to replace the static mounting hardware on stage lights, an automated yoke provides the pan and tilt features built into a traditional automated fixture. When combined with an LED fixture or colour scroller, the most common features of an automated light can be readily duplicated. "Auto-yokes" are often promoted as a way to modernize and increase the flexibility of an inventory of lighting fixtures at a reduced cost to replacement with intelligent lights. Generally, moving mirrors are faster at adjusting a lights position than moving head fixtures; however, moving-heads-style fixtures have a far larger total range of movement. The movement from mirror lights tends to be rectilinear, because the center of movement for both axes is usually in the same place (behind the centre of the mirror). Moving head fixtures have a much more concentric range of motion, owing to the separation of the axis of motion. Much smoother operation can be achieved through one axis of a moving head luminaire describing a circle (usually pan) and the other (tilt) changes the diameter of the circular movement. In early luminaires a pseudo rotating gobo effect could be achieved by moving the tilt in line with the other axis and then moving the pan from end stop to end stop. See also Stage lighting instrument References Stage lighting