Prelim

Question 1

Defined as the intensity of light per unit area. Referred as lighting or man-made lighting

Answer 1

Illumination

Question 2

The optimization of energy consumption, with no sacrifice in lighting quality

Answer 2

Energy efficiency

Question 3

The amount of illumination or luminous flux per unit area.

Answer 3

Quantity of light

Question 4

The distribution of brightness in the lightning installation or the mixture of all the items related to illumination.

Answer 4

Quality of light

Question 5

What are the four factors that affect illumination

Answer 5

> Brightness
Contrast
Glare
Diffuseness

Question 6

What are the six elements that quality of light includes

Answer 6

>Brightness
>Glare
>Color
>Psychological reaction to color and fixtures
>Contrast 
>Diffuseness

Question 7

It is the light that seems to radiate from the object being viewed

Answer 7

Brightness

Question 8

The difference in brightness of the brightness ratio between an object and its background

Answer 8

Contrast

Question 9

It is a strong, steady, dazzling light or reflection. An excessive luminance and or excessive luminance ratio in the field of vision.

Answer 9

Glare

Question 10

An annoying brightness of light in a person’s normal field of vision

Answer 10

Direct Glare

Question 11

A more serious and difficult to control brightness reflected by a glossy object

Answer 11

Indirect or Reflected Glare

Question 12

It is the control of shadows cast by light.

Answer 12

Diffuseness

Question 13

A radiant energy that is capable of exciting the retina and producing a visual sensation

Answer 13

Light

Question 14

The visible portion of the electromagnetic spectrum extends from ___ to about ___ nanometers.

Answer 14

380 - 780 nanometers

Question 15

In the electromagnetic spectrum, Light is located between ______ and ______ radiation

Answer 15

Ultraviolet - Infrared radiation

Question 16

Longer wavelengths results to

Answer 16

Lower frequency and Lower energy

Question 17

Shorter wavelengths results to

Answer 17

Higher frequency and Higher energy

Question 18

1 watt at 555 nanometers is equivalent to how many lumens

Answer 18

683.0 lumens

Question 19

What are the three types of reflection

Answer 19

> Specular
Spread
Diffuse

Question 20

It is when an incident light hits an object and bounces off

Answer 20

Reflection

Question 21

It is the region with slightly shorter wavelength immediately adjacent to the violent end of the visible spectrum

Answer 21

Ultraviolet

Question 22

Shortest wavelengths (380 - 450 nm)

Answer 22

Violet

Question 23

Longest wavelengths (630 - 770 nm)

Answer 23

Red

Question 24

Wavelengths (450 - 490 nm)

Answer 24

Blue

Question 25

Wavelengths (490 - 560 nm)

Answer 25

Green

Question 26

Wavelengths (560 - 590 nm)

Answer 26

Yellow

Question 27

Wavelengths (590 - 630 nm)

Answer 27

Orange

Question 28

The least harmful and most commonly found type of UV light, often called black light for its relative harmlessness and ability to cause fluorescent materials to emit visible light.

Answer 28

UV-A

Question 29

The most destructive form of UV for it is enough to damage biological tissue.

Answer 29

UV-B

Question 30

A type of UV that is almost completely absorbed in air within a few hundred meters.

Answer 30

UV-C

Question 31

The region with slightly longer wavelengths immediately adjacent to the red end of the visible spectrum

Answer 31

Infrared

Question 32

The longest wavelengths in the electromagnetic spectrum.

Answer 32

Radio Waves

Question 33

It has much higher energy and shorted wavelengths than ultraviolet light which lengths between (0.03 - 3) nanometers.

Answer 33

X - rays

Question 34

The smallest wavelengths and the most energy of any wave in the electromagnetic spectrum.

Answer 34

Gamma Rays

Question 35

It falls in the range of the electromagnetic spectrum between radio and infrared light.

Answer 35

Microwaves

Question 36

It is the measure of capability of a material to transmit incident light

Answer 36

Transmittance

Question 37

It is the measure of total light reflected

Answer 37

Reflectance

Question 38

It occurs when light is reflected away from the surface at the same angle as the incoming light's angle

Answer 38

Specular reflection

Question 39

It occurs when an uneven surface reflects light at more than one angle

Answer 39

Spread reflection

Question 40

It occurs when a rough or matte surface reflects the light at many different angles

Answer 40

Diffuse reflection

Question 41

Diffuse Reflection is sometimes called

Answer 41

Lambertian Scattering

Question 42

It demonstrates the law of reflection, which states that the angle between the incident ray and a line that is normal to the surface is equal to the angle between the reflected ray and normal.

Answer 42

Specular reflection

Question 43

It occurs when photons from the incident light hit atoms and molecules and cause them to vibrate.

Answer 43

Absorption

Question 44

This occurs when light waves changes direction as they pass from one medium to another.

Answer 44

Refraction

Question 45

It is the ratio of the speed of light in a vacuum to the speed of light in the material

Answer 45

Index of refraction

Question 46

It shows the relationship between the incident angle and the refractive index

Answer 46

Snell's law

Question 47

It occurs when light passes through an object that absorption, refraction, reflection and diffusion occur at once.

Answer 47

Transmission

Question 48

Instead of completely transmitting light, an object can absorb part or all of the incident light, usually by converting it into _____.

Answer 48

Heat

Question 49

It occurs when light strikes a rough surface and the light is reflected or transmitted in many different direction at once.

Answer 49

Diffusion

Question 50

It it the bending and spreading of waves around an obstacle

Answer 50

Diffraction

Question 51

It occurs when light bounces off an object in a variety of directions

Answer 51

Scattering

Question 52

What are the Three broad methods of illumination

Answer 52

>General Lighting >Local Lighting >Combined General and Local Lighting

Question 53

It is a part of the eye that the ray of light enters

Answer 53

Cornea

Question 54

It is the ability of the eye to adjust to higher or lower levels of luminance

Answer 54

Adaptation

Question 55

The ability of the eye to focus sharply on distant or close objects

Answer 55

Accommodation

Question 56

The cones operate during the day and nominal daylight conditions and enables us to see in detailed color.

Answer 56

Photopic Vision

Question 57

It is the receptors of the retina

Answer 57

Rods and Cones

Question 58

If light conditions are not bright , as the rods can only " see" a black and white image. what vision is used

Answer 58

Mesopic Vision

Question 59

The eyes losses all its facility to see in color.

Answer 59

Scotopic Vision

Question 60

A special branch of radiometry in which visible light is being measured

Answer 60

Photometry

Question 61

It is the measurement on how much flux (lumens) is emitted within a small conical angle in a particular direction from a light source or luminaire

Answer 61

Luminous Intensity

Question 62

It is the unit of measurement of Luminous Intensity

Answer 62

Candela

Question 63

It is the measurement of the visible light outputs of lamps, where light is not directional. It refers to the visible light emitted in all directions at any given moment

Answer 63

Luminous Flux

Question 64

It is the total radiation being emitted from a light in all directions

Answer 64

Radiant Flux

Question 65

It is the unit of measurement of Luminous Flux

Answer 65

Lumens

Question 66

It is the density of Luminous power

Answer 66

Illuminance

Question 67

It is the unit of measurement of Illuminance

Answer 67

Lux

Question 68

It is the measure of the amount of light emitted from a surface

Answer 68

Luminance

Question 69

It is the unit measurement of Luminance

Answer 69

>Candela per square meter | >Footlambert

Question 70

1 footlambert is equivalent to how many candela per square meter

Answer 70

3.4263 cd/m^2

Question 71

Designed to give uniform and generally, diffuse lighting throughout the area under consideration.

Answer 71

General Lighting

Question 72

Provide a restricted area of relatively high intensity

Answer 72

Local Lighting

Question 73

Used in spaces where the general visual task is low, but supplementary is required in a limited area for particular task.

Answer 73

Combined General and Local Lighting

Question 74

A material that absorbs some wavelengths and transmits others

Answer 74

Transmissive Filter

Question 75

A material that absorbs some wavelengths and reflects others

Answer 75

Reflective Filter