Lighting Technologies Quiz 1

What does PAR stand for?

Parabolic Aluminized Reflector

What type of lenses do ERS use?

Plano-convex lenses. These lenses & their configuration control the angle of the beam of light emitted by the instrument.

How did the ERS get its name?

It got its name from the ellipsoidal reflector inside the fixture

How did the Fresnel get its name?

It got its name from its inventor, the French physicist and engineer Augustin-Jean-Fresnel.

How did the PAR get its name?

It got its name from an acronym that describes its internal optical design

What does the black knob of death on a lighting fixture do?

It securely locks the orientation of the lighting fixture to prevent it from slipping, dropping, or swinging out of focus.

What does AC stand for?

Alternating Current. It alternates the direction of the current by approx 60 cycles per second.

What are some things that use AC power?

Refrigerators, toasters, and air conditioners.

What does DC stand for?

Direct Current. Electrical current flows in one direction; hot flows to hot and neutral flows to neutral.

What’s an example of something that uses DC power?

Batteries and LED lights.

Hard Patch

Physically plugging cables (connecting the circuit to the dimmer) like in a Spaghetti board

Soft Patch

On the light board connecting the dimmer to a channel

Series Circuit

Going from light bulb to light bulb to make a circuit. If 1 bulb burns out the circuit gets cut off

Parallel Circuit

If 1 bulb burns out the circuit can stay complete and the electricity keeps on going.

Circuit

The “outlet” that an instrument is physically plugged into

Dimmer

Where a light is physically getting powered

Channel

A number assigned to an instrument on a light plot by the lighting designer

How many channels does one DMX universe contain?

512

All intelligent fixtures get connected to what?

A data cable, or DMX

How do you daisy chain intelligent fixtures w/ DMX?

Run DMX cable out from a DMX port into the first fixture. Run a second DMX cable from the out-port of the first fixture into the next fixture and so on. A terminator is put in the last fixtures out port, to tell the DMX signal it’s the end of the chain

For intelligent fixtures, the address is patched to what?

The channel number

When using intelligent fixtures, the circuit/dimmer number is patched to…

A Power channel 512

Dimmers that are used to provide pwr for intelligent fixtures must be “Switched”, meaning they…

Can only be turned on at full power or off completely

What type of reflector is used in an ERS fixture?

Ellipsoidal Reflector Spotlight

What type of reflector is used in a Fresnel fixture?

A Spherical reflector

What type of reflector is used in a PAR 64?

Parabolic Aluminized Reflector

Which Source 4 PAR lens is this and what does it cause the beam of light to do?

It’s a Very Narrow Spot lens. It causes the beam of light to be very narrow and bright with crisp edges.

Which Source 4 PAR lens is this and what does it cause the beam of light to do?

It’s a Narrow Spot lens. The glass is stippled. This creates a narrow, round beam of light with slightly softened edges.

Which Source 4 PAR lens is this and what does it cause the beam of light to do?

This is a Medium Flood Lens. It has fewer facets and creates a medium-wide, oval light beam rather than a round one. The beam of light is also less bright than the NSP or VNSP lenses due to the facets.

Which Source 4 PAR lens is this and what does it cause the beam of light to do?

This is a Wide Flood Lens. It has many facets and creates a wide, oval wash of light w/ a soft edge. Due to the many facets, this lens causes the beam of light to be softer than the 3 other lenses.