Chapter 4 Flashcards
(41 cards)
___ the earliest known unit of illumination still used today.
Foot-candle
_____First developed a working incandescent light bulb using carbon-fillament lamp in _____
Joseph Swan, February 5, 1879
On _____, the niagra falls power company became the 1st commercial utility to produce and transmit hydroelectric power.
August 26, 1895
Developed technical standards, specifications and design techniques to govern the design and construction of building lighting and electrical systems.
Professional Organization
The ____ of a human is composed of the eye, optic, nerve, and certain parts of the brain
Visual System
The ____ is that part of the visual system where the impulses are processed.
Brain
The eye functions much like a simple, very crude camera. race of light pass through the transparent cornea of the eye and through an opening called the ____.
Pupil
Light is a form of energy known as _____.
Electromagnetic Radiation
____ number of wave cycles per second.
Frequency
_____ is the amount of light incident on (striking) a surface.
Illuminance
A ___ is a device that generates light.
lamp
____ is the measure of the perceived power of light expressed in lumens (lm).
Luminous flux
____ is the SI unit of luminous intensity.
Candela (cd)
______ is the ratio of the light output of a light source (a specific lamp) to the electrical energy consumed to produce the light source.
Luminous Efficacy
The _____ is a method of numerically comparing the color distribution of a light source to your reference lamp.
Color Rendering Index (CRI)
____ are filament-light coils at the end(s) off the bulb that act as terminal for the electric circuit.
Cathodes
______ sometimes called “general lighting”, provides uniform illumination or throughout the space
Ambient Lighting
sometimes called “task lighting”. illumination provided for a specific visual function.
local lighting
____ is directional lighting used to emphasize a particular object or area.
accent lighting
_____ is light source that adds a quality of interest to the space.
decorative lighting
____ ensures the safety of people involved in a potentially hazardous process.
safety lighting
A luminaire that is hang with a cord, chain, or tube that enables it to be suspended from a ceiling or other support.
pendent
Recessed Luminaires are mounted above the ceiling or behind the wall or other surface so that any visible projection of light is ___.
Insignificant
____ is a luminaire that is designed to emit an intense, concentrated beam of light with usually no more than a 20° divergence (spread) from where it is directed.
Spotlight
