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Visible light

is the small portion

of the electromagnetic spectrum

that our eyes can perceive.

EYE

Acts as the “receiver”

BRAIN

Acts as the “interpreter”

Artificial Light

are other sources of light which developed to compensate for or assist the natural light.

incadescent lamp

produces light by heating a filament until it glows

compact fluorescent light

produces light through an electric discharge

discharge lamps

produces light through an electric discharge in a gas or vapor

light emitting diode

produces light through a semiconductor, whihc emits light when an electric current passes through it

Halogen Lamp

A type of incandescent lamp with halogen gas

Neon Lamp

Uses neon or other gases to produce light in bright, vibrant colors.

Induction Lamp

Similar to fluorescent but uses electromagnetic fields instead of electrodes.

Laser Light

Highly focused, monochromatic beam of light.

OLED (Organic Light Emitting Diode)

Thin, flexible light panels made of organic compounds.

Ambient or General Lighting

light that fills a large area,

Task Lighting

lighting that helps you perform a task,

Accent Lighting

designed to highlight key features of a room,

Decorative Lighting

purely for aesthetic purposes

Natural Lighting

a lighting source that closely replicates natural sunlight

Brightness

What we perceive

A subjective visual sensation

How bright or dark a surface appears to us

Luminance

What we can measure

An objective physical quantity

luminaire

emits light in one of three directions

Downward light

has a restricted angular spread

Upward light

usually covers a large area of the ceiling

Multidirectional light

is emitted in all directions

Visual Comfort Probability

Percentage of people expected to find the lighting comfortable

Contrast

difference between light and dark

Low contrast

similar brightness levels

High contrast

strong differences between bright and dark areas

Distribution

Where light is spread

Direction

Where the light comes from