The color of light

Question 1

It is the ability to DISTINGUISH and INTERPRET different wavelengths of visible light.

Answer 1

Color perception

Question 2

An object that absorbs all of the longer wavelengths and reflects the shorter wavelengths will be perceived as ________ or _________.

Answer 2

violet , blue

Question 3

A light source producing a BLEND of wavelengths that are evenly distributed across the light spectrum is percieved by the human eye as __________ or ____________.

Answer 3

white, normal light

Question 4

When they are combined togetherm primary colors of light produce ________.

Answer 4

white

Question 5

The colors of pigment are __________, _________ and _________ and are opposite of the colors of light

Answer 5

magenta, cyan, yellow

Question 6

A _________ light source emits a fairly EVEN DISTRIBUTION of all wavelengths of light. Most light sources are not fully __________.

Answer 6

chromatic x2

Question 7

A _________ light source produces visible light in a very small range of wavelengths;

Answer 7

monochromatic

Question 8

The type of wavelengths emitted by a light source will influence _________.

Answer 8

color

Question 9

A light source that produces a blend of wavelengths evenly distributed across the light spectrum is perceived as _______________.

Answer 9

white light

Question 10

What are the two methods are used to rate the QUALITY OF COLOR emitted by a light source.

Answer 10

Color Temperature, Color Rendering Index

Question 11

It is the ability to distinguish fine details. It is the ____________ of vision that is necessary to perfrom tasks such as reading, etc.

Answer 11

Visual acuity, keenness

Question 12

It is a device that generates light

Answer 12

lamp

Question 13

This kind of lamps provide light source by INCANDESCENCE, which is the emission of light caused by heating the filament.

Answer 13

incandescent lampS

Question 14

Gaseous discharge lamps can be divided into 2 or more subcategory such as:

Answer 14

low-pressure lamps, high-intensity discharge

Question 15

Low-pressure lamps examples

Answer 15

fluorescent lamps
-low pressure sodium lamps

Question 16

High intensity discharge lamps

Answer 16

mercury vapor lamps
metal halide lamps
high pressure sodium lamps

Question 17

It is a COMPLETE LIGHTING UNIT which consists of lamps, lamp sockets, any lenses, refractors or louvers, any ballasts and the housing.

Answer 17

luminaire

Question 18

A __________ is a luminaire that does not have lamps.

Answer 18

light fixtureS

Question 19

The term ________ is generally used to describe a luminaire.

Answer 19

lantern

Question 20

The term ________ is generally used to describe a luminaire.

Answer 20

lantern

Question 21

It is the measure of the perceived power of light expressed in LUMENS.

Answer 21

Luminous flux

Question 22

A __________ is defined as the QUANTITY of light given out through a STERADIAN by a source of one ________ of intensity radiating equally in all directions.

Answer 22

lumen, candela

Question 23

___________ is the SI unit of luminous INTENSITY — that is the power emitted by a light source in a particular direction.

Answer 23

Candela

Question 24

It is the ratio of the light output of a light source to the electrical energy consumed to produce the light source. It is expressed in _________.

Answer 24

Light efficacy, LPW

Question 25

The color of light emitted by a light source correlates to the _____________ of the emitting source. A _______ body is a theoritcally ideal body thet perfectly radiates energy.

Answer 25

temperature, black

Question 26

Technically, color temperature only applies directly to light sources that _________. Gaseous discahrege lamps is rated by their _______ or ________ color temperature

Answer 26

incandesce ( emit light from heating), correlated, apparent

Question 27

It is the method of numerically comparing the color distribution of a light source to a reference lamp.

In theory, a lamp with a ________ CRI more closelt emulates the reference lamp and provides a better color rendition.

Answer 27

color rendering index (CRI)

higher

Question 28

A ________________ curve is a graphic presentation of the quantities of light emmited by a lamp by wavelength component. These curves are a plot or _______ power versus specific ________ across the light spectrum.

They provide a visual ________ of the color characteristics of the light emittted by the source over the visible part of the spectrum.

Answer 28

spectral power distribution

radiant

wavelength

fingerprint

Question 29

It is the rated life of a lamp in its median life expectancy, expressed in hours. It is the cumulative time that lapses before ___% of a representative group of lamps have failed and the other lamps in the group continue operating.

Answer 29

lamp life, 50

Question 30

As lamps operate, the ___________ will decrease. As incandescent lamps operate their light output degrade to about ____% of lamp’s initial lumen output.

Fluorescent degradation - ____ to ___%
HID degradation - ____ to ___%

Answer 30

luminous flux
85

60 , 80

50 70