What is the biggest advantage of an ellipsoidal reflector spotlight?

There are several advantages of the ERS that make it one of the most common lights in a theatre. Its Ellipsoidal lens means only a 500w or 750w bulb is needed, instead of a 1000w bulb, while retaining the same brightness.

What does an ellipsoidal reflector do?

An ellipsoidal reflector spotlight features a built-in reflector in the shape of half an ellipse. By positioning the source light within the ellipse, rays of light emanating from the source are bounced off the surface and reflected to a single point, called the conjugate focal point (CFP).

What is an ellipsoidal reflector often called?

The “ellipsoidal reflector spotlight,” or ERS, has been called by various names through the years. Theater professionals may refer to it as an “ellipse” or “ellipsoidal.” “Source Four” is a brand name, and that term is used, too. You may also hear long-time stagehands call it a “Leko,” pronounced LEE-koh.

What is the metal disc with a pattern that is inserted in an ellipsoidal spotlight called?

Terms in this set (32) any pattern cut out of thin metal that, when placed inside or in front of an ellipsoidal spotlight (pattern projector), produces a shadow pattern. also called gobo.

What are the two basic categories of lights?

There are two basic types of light sources: Incandescence and Luminescence.

Why is a Fresnel lighting instrument called a Fresnel?

The lens focuses the light by tilting each ring of glass slightly more towards the center as the distance is increased from the center of the lens. These lenses are named after their inventor, Augustin-Jean Fresnel, who developed the lens initially for use in lighthouses.

What is unique about an ellipsoidal reflector?

Ellipsoidal Reflectors Ellipsoids collect a much higher fraction of total emitted light than a spherical mirror or conventional lens system. The effective collection f/#s are very low, and the geometry is well suited to the small source size of an arc lamp.

What are par lights used for?

PAR CANS Lights. PAR Cans are the most widely used light for concerts, clubs, and theatrical lighting. PAR cans come in a wide variety of sizes and shapes; from the minuscule PAR16 to the 1000 watt PAR64 cans.

Where are Striplights used?

Striplights are often used to color a cyclorama, or can alternately be positioned behind the proscenium arch to provide a general overhead color wash. Often, in older and low budget venues such as churches and schools, striplights are the primary lighting source. Nowadays, LED striplights are becoming more common.

Why is it called a gobo?

A “Gobo” is a small stencilled circular disc, and used in lighting fixtures to create a projected image or pattern. The term Gobo is short for “Go Between Optics”, describing the location where it needs to be positioned in the light path of a lighting fixture.

How do you focus on an ers?

Basic Bench Focusing Steps

1. Create a hard edge by adjusting the barrel.
2. Center the hot spot by rotating the outer knob clockwise until the knob is tight. Loosen the knob until the hot spot is centered in the field.
3. Flatten the field by rotating the inner knob.

What are the 4 types of light?

As Sudhakaran mentions in the video, there are four types of light that every aspiring photographer should recognize: hard, soft, specular, and diffused. Differentiating between the four can be tough for the untrained eye.

What does an ellipsoidal reflector light stand for?

Source Four ERS. Ellipsoidal reflector light (abbreviated to ERS, or colloquially ellipsoidal or ellipse) is the name for a type of stage lighting instrument, named for the ellipsoidal reflector used to collect and direct the light through a barrel that contains a lens or lens train.

How does an elliptical reflector collect light rays?

Elliptical Reflectors Elliptical Reflector Diagram An elliptical reflector collects light rays generated from a primary focal point and directs it to a secondary focal point.

Where are the shutters on an ellipsoidal reflector?

A series of four shutters mounted at the internal focal point (the place where the varying angles of light coming off the reflector meet) of the unit. These allow for precise shaping and sizing of the unit’s beam as lines. Additionally, an iris may be present to size the beam circularly.

What kind of rhodium does an elliptical reflector use?

An elliptical reflector collects light rays generated from a primary focal point and directs it to a secondary focal point. Stock reflectors are coated with electro-deposited bright rhodium.