source four par造句

The suffix identifies the Source Four PAR as a parabolic aluminized reflector ( PAR ).
ETC Source Four PAR, Beam projector, Stage lighting, SeaChanger Color Engine, MA Lighting, Behringer
Several major conventional theatrical lighting manufacturers have introduced different fixtures based on the Source Four PAR's design.
The "'Source Four PAR "'is a stage lighting instrument manufactured by Electronic Theatre Controls.
Since the HPL lamp is proprietary to ETC, these imitation fixtures are often considered less efficient than the Source Four PAR.
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Source Four PARs are also promoted as being " greener ", in that HPL lamps use much less power to achieve the same light output.
The shortened barrel of a Source Four PAR ( relative to a traditional PAR fixture ) makes the light source more visible at a much greater angle.
Source Four PAR fixtures have several parts, and in some environments ( touring, rentals ) require a greater measure of regular maintenance compared to traditional PAR cans.
The Source Four PAR can be two or three times more expensive than traditional PAR cans, however replacement lamps are generally significantly less expensive than traditional PAR lamps, so the cost is considered to even out over time.
In some cases, this may be considered an unwelcome effect as it can cause lens flare or change the audience's perception of a theatrical scene . barn doors attach to Source Four PARs to eliminate this source visibility.
The Source Four PAR may have revolutionized fixture maintenance and inventory control in much the same way the Source Four Ellipsoidal Reflector Spot ( ERS ) did for the traditional spotlight, however many lighting designers argue that the fixture lacks the " raw " quality of light achieved by a traditional PAR can.
Also, the distinct " oblong " shape of the beam of light from a traditional PAR lacks definition when used with a Source Four PAR's medium ( MFL ) or wide ( WFL ) flood lenses, and is completely non-existent when the very narrow ( VNSP ) or narrow ( NSP ) is utilized.