LIGHT ASSIGNMENT

Light Assignment

[Name of the student]

[Name of the instructor]

[Submission date]

Light Assignment

Part One

Dispersion of Artificial Light

The following are some of the various ways that artificial light is dispersed:

Diffuse up lighting

Concentrated up lighting

Diffuse down lighting

Concentrated down lighting

Multidirectional lighting

Semi-direct lighting

Semi-indirect lighting

Diffuse up lighting

Purpose: To achieve uniform ambient lighting in a space. Light is reflected off the ceiling to introduce it indirectly into the space.

Property: Beam spreads from 80° to 120° upwards. Even illumination in the space.

Diffuse uplightingconcept

Concentrated up lighting

Purpose: Create areas of high luminance on the ceiling with dark areas in between.

Property: Beam spreads from 30° or lower upwards.

Concentrated up lighting concept

Diffuse down lighting

Purpose: To achieve uniform ambient lighting in a space. To illuminate the horizontal surface below the luminaire.

Property: Beam spreads from 80° to 120° downwards.

Diffuse down lighting concept

Concentrated down lighting

Purpose: Create areas of high luminance on the floor with dark areas in between.

Property: Beam spreads from 30° or lower downwards.

Concentrated down lighting concept

Multidirectional lighting

Purpose: To create a stimulating, high brightness interior.

Property: Light emitted in several directions.

Multidirectional lighting concept

Semi-direct lighting

Purpose: Light emitted in only upward and downward direction. 60% to 90% of light is downwards.

Property: Moderate contrast in the space.

Semi-direct lighting concept

Semi-indirect lighting

Purpose: Light emitted in only upward and downward direction. 60% to 90% of light is upwards.

Property: Moderate contrast in the space.

Semi-indirect lighting concept

Factors That Affect Light Distribution

The following are a few factors that affect the distribution of light:

Illuminance

Illuminance is the amount of light falling on a surface.

Luminance

Luminance is the amount of reflection, from a surface, of light.

Contrast

Contrast is the relationship of an object's background to its brightness.

Reflectance

Reflectance is the ratio of light falling on a surface to the light reflected from a surface.

Categories of Lighting Affects

The following are a few categories of lighting affects:

Wall Washing

Wall Grazing

Slot Lighting

Accent lighting

Cove lighting

Wall Washing

Purpose: To achieve even illumination on a vertical surface, side to side and top to bottom. The luminaire is placed at one-quarter of the distance away from the surface. Spacing between luminaires varies from one-quarter to one-half of the wall height depending on the luminaire.

Property: Even illumination on a vertical surface.

Use: To highlight a vertical surface, hiding the surface imperfections, and flattening the texture.

Wall washing example

Wall Grazing

Purpose: To reveal the texture of a surface. The luminaire is placed intentionally close to the surface.

Property: Even wall lighting highlighting its texture.

Use: Used to illuminate surfaces with interesting textures such as stone, brick, etc.

Wall Grazing example

Slot Lighting

Purpose: To light a wall accentuating the junction of the wall and the ceiling, indirectly lighting the space.

Property: Brighter illumination at the top of the wall; indirect illumination in the rest of the space.

Use: To accentuate the ceiling plane.

Slot Lighting example

Accent lighting

Purpose: To illuminate an object to focus attention on it. The luminaire is ideally located so that it produces light about 30° from vertical, which is generally agreed best for art.

Property: Even distribution of light on the object

Use: To accentuate an object in space.

Accent lighting example

Cove lighting

Purpose: To directly illuminate the ceiling, and indirectly illuminate a space, accentuating the ceiling plane.

Property: Brighter ceiling ...