8.3 LIGHTING DESIGN – ARTIFICIAL LIGHTING & LIGHT LAYERING

ARTIFICIAL LIGHTING

Artificial lighting refers to any man-made light source. It can be controlled, designed, and directed to meet specific needs.

Thermal Light Sources

• Light is produced by heating a filament until it glows.

• Incandescent lamps, halogen lamps.

• Mostly phased out in general lighting, but still used in decorative, theater, or specialty lighting where color quality is critical

Incandescent

Traditional light bulb that produces light by heating a filament until it glows.

Incandescent

Suitable for short-term or low-intensity applications where color accuracy is crucial.

Halogen Incandescent

-A type of incandescent light that is more efficient and emits a bright, white light by heating a tungsten filament in halogen gas.

Halogen Incandescent`

Suitable for applications requiring bright, focused light, such as spotlights and outdoor floodlights.

Low-Intensity Discharge Lamps

Electric current excites low-pressure gas (like mercury vapor or neon), producing UV or visible light. A phosphor coating often converts UV to visible light.

Low-Intensity Discharge Lamps

Fluorescent tubes, Compact Fluorescent Lamps (CFLs), neon lamps.

Low-Intensity Discharge Lamps

Early usage in offices, schools, hospitals, and signage, although being replaced by LEDs.

Fluorescent (Tube)

A commonly used type of lamp that produces light by using a phosphorescent coating inside a tube filled with gas.

Fluorescent (Tube)

More common in commercial and office spaces than incandescent due to better efficiency and longer lifespan.

Fluorescent (Tube)

Best suited for larger areas like offices, warehouses, and commercial spaces where high-output lighting is needed.

Compact Fluorescent Lamp (CFL)

Smaller versions of fluorescent lamps designed to replace incandescent bulbs, offering better energy efficiency and a longer lifespan.

Compact Fluorescent Lamp (CFL)

Ideal for residential use, fitting into standard light fixtures and providing an easy, energy-efficient replacement for incandescent bulbs.

High-intensity discharge lamps

Electric arc through high-pressure gases and metals, producing bright, intense light.

High-intensity discharge lamps

Mercury vapor, Metal halide, High-pressure sodium lamps.

High-intensity discharge lamps

Street lighting, stadiums, large industrial spaces; slowly being replaced by LEDs.

Semiconductor light sources

Electrons in a semiconductor recombine with holes, releasing photons (light).

Semiconductor light sources

Light Emitting Diodes (LEDs), Organic LEDs (OLEDs), Laser diodes.

Semiconductor light sources

Dominant in most architectural applications - offices, homes, street lighting, retail, and smart systems.

Light Emitting Diode (LED)

Highly energy-efficient and long-lasting. They are versatile, with various color temperatures and brightness levels, making them suitable for many applications.

Warm White

2500K - 3000K

Warm White

Warm, cozy, intimate, personal

Warm White

Produces a yellowish, cozy incandescent bulbs. light, similar to traditional

Warm White

Applications: residential spaces like living rooms, bedrooms, and dining areas.

Cool White

3100K - 4500K

Cool White

Calm, sociable, inviting, pleasing

Cool White

Emits a neutral, slightly bluish light, creating a brighter and more focused environment.

Cool White

Applications: social halls, conference rooms, lobbies.

Daylight

4600K - 6500K

Daylight

Neat, efficient, alert

Daylight

Mimics natural daylight with a crisp, bluish-white tone, offering high contrast and clarity.

Daylight

Applications: task lighting, kitchen, workspaces, retail spaces, garages, offices.

Control and Flexibility

Artificial lighting can be easily adjusted in terms of brightness, direction, and color temperature to suit specific tasks or moods. It can be turned on or off at will, providing consistent illumination.

Design Freedom

It allows designers more room for creativity in shaping the mood and function of a space.

Availability

Unlike natural light, artificial lighting is available at any time of day, providing consistent illumination when and where it is needed.

Energy Consumption

Without energy-efficient solutions, artificial lighting can lead to higher electricity bills and environmental impact.

Color Rendering

Not all artificial lights accurately render colors. Low CRI lighting can distort the appearance of objects and interiors.

Light Pollution

Poorly designed exterior lighting can contribute to light pollution, negatively impacting the environment and wildlife.

LIGHT LAYERING

The intentional use of multiple light sources and types to achieve balance, functionality, and atmosphere in a space.

Lighting Fixtures

Luminaire

Lighting Fixtures

An electrical lighting device containing one or more light sources, such as lamps, and all the accessory components required for its operation to provide illumination to the environment.

Chandeliers

Decorative fixtures that hang from the ceiling, often used in dining rooms and foyers. They provide ambient lighting and serve as a focal point.

Flush Mounts

Installed directly against the ceiling, ideal for low-ceiling areas. Provide general ambient lighting.

Semi-Flush Mounts

Hang slightly below the ceiling, offering a balance between flush mounts and chandeliers.

Sconces

Attached to walls, providing both ambient and accent lighting. Common in hallways, bathrooms, and living rooms.

Wall Washers

Designed to spread light evenly across a wall, enhancing the perception of space and highlighting architectural features.

Table Lamps

Portable lamps used for task lighting on desks, tables, and bedside tables.

Floor Lamps

Free-standing lamps that provide both ambient and task lighting. Useful in living rooms and reading areas.

Downlights (Can Lights)

Installed into the ceiling, providing a clean look and focused, downward lighting. Ideal for kitchens, bathrooms, and corridors.

Wall Grazers

Installed close to the wall to highlight textures and create dramatic shadow effects.

Track Lighting

Mounted on a track that provides power, allowing for adjustable and directional lighting. Common in galleries and retail spaces

Cable Lighting

Similar to track lighting but uses cables instead of tracks, offering a more flexible design option.

Single Pendants

Hang from the ceiling by a cord, chain, or rod. Used over kitchen islands, dining tables, and as statement pieces.

Multi-Light Pendants

Multiple light sources from a single fixture, providing more light and visual interest.

Floodlights

High-intensity lights used to illuminate large outdoor areas such as driveways and backyards.

Path Lights

Low-level lights used along walkways and garden paths for safety and aesthetic appeal

Wall Lights

Mounted on exterior walls to enhance security and provide general lighting.

Ambient Lighting

General Lighting

Ambient Lighting

Lighting that provides an overall illumination to a space. It sets the tone and mood of the room and is intended to create a uniform light level throughout the area without being too intense or creating harsh shadows.

Ambient Lighting

It is used to make a space usable by ensuring there's enough light for general activities, such as walking around or socializing.

Ambient Lighting

Examples:

Ceiling-mounted fixtures, chandeliers, or recessed lights that illuminate the entire room.

Ambient Lighting

Applications:

Living rooms, offices, hallways-basically any space where a balanced level of light is required for everyday activities.

Task Lighting

Lighting is used to illuminate specific areas where more intense, focused light is needed for activities that require concentration.

Task Lighting

It provides localized lighting to workspaces like desks, kitchen counters, or makeup stations to make specific tasks easier to perform.

Task Lighting

Examples:

Desk lamps, under-cabinet lights in kitchens, or reading lamps.

Task Lighting

Applications:

Workspaces, study areas, kitchens, bathrooms, and any space where concentrated light is needed for specific tasks.

Accent Lighting

Decorative Lighting

Accent Lighting

Primarily used to enhance the aesthetic appeal of a space. It adds style, texture, and interest to the design while drawing attention.

Accent Lighting

It's used to create visual interest through focal points, highlight artwork or architectural features, or simply serve as a design statement in a room.

Accent Lighting

Examples:

Spotlights, wall-mounted lights, or track lighting.

Accent Lighting

Application:

Museums, galleries, or any place where visual emphasis is needed, including outdoor landscaping.

Direct Lighting

0% upward, 100% downward

Direct Lighting

Light is fully directed downwards, focusing on illuminating surfaces directly below the fixture. It's highly efficient for task lighting.

Direct Lighting

Provides strong illumination to a focused area with clear shadows.

Direct Lighting

Advantages:

• Efficient use of light with minimal waste.

• Maximizes brightness where needed.

Challenges:

• Can cause harsh shadows or glare if overused.

Direct Lighting

Downlights, pendant lights, or task lights.

Direct Lighting

Applications:

Task lighting (desks, workbenches, reading lamps) where focused light is essential, high-bay industrial lighting, and spotlighting.

Indirect Lighting

100% ирward, 100% downward

Indirect Lighting

The light is directed entirely upward, and bouncing off the ceiling or walls.

Indirect Lighting

It creates diffuse, soft ambient lighting with no direct glare.

Indirect Lighting

Advantages:

• Eliminates glare and shadows, creating a pleasant and soft environment.

• Enhances the perception by "bouncing" light off surfaces.

Challenges:

• Less efficient than direct lighting because it relies on surfaces to reflect light, leading to potential light loss.

• Requires light-colored or reflective ceilings to be effective.

Indirect Lighting

Cove lighting, wall-mounted uplights, or floor lamps that direct light towards the ceiling.

Indirect Lighting

Applications:

Ambient lighting in offices, living rooms, or open spaces where glare is undesirable. It's also commonly used in architectural lighting for a softer look.

Direct-Indirect Lighting

50% upward, 50% downward

Direct-Indirect Lighting

This type of lighting distributes light equally upwards and downwards, offering both task and ambient lighting.

Direct-Indirect Lighting

Balanced illumination that minimizes harsh shadows while providing adequate task lighting.

Direct-Indirect Lighting

Advantages:

• Provides a balance between ambient lighting and task lighting.

• Reduces glare while still offering functional lighting.

Challenges:

• May not provide enough task lighting in very specific or focused work areas.

• Requires careful ceiling surface design for optimal reflection of the upward light.

Direct-Indirect Lighting

Pendant lights, wall sconces, or certain types of chandeliers.

Direct-Indirect Lighting

General-purpose lighting in offices, educational facilities, or lounges where balanced lighting is required.

Semi-Direct Lighting

10-40% downward upward, 60-90%

Semi-Direct Lighting

Most of the light is directed downwards for task lighting, with some light being diffused upwards for ambient purposes.

Semi-Direct Lighting

Provides downward lighting while adding a soft glow to the ceiling, reducing harsh shadows.

Semi-Direct Lighting

Advantages:

• Provides strong illumination for specific tasks while still offering a degree of softness through upward-directed light.

• Reduces the harshness of purely direct lighting.

Challenges:

• The upward component may be too weak to significantly impact the overall ambiance.

Semi-Direct Lighting

Ceiling-mounted fixtures with reflective components.

Semi-Direct Lighting

Applications:

Spaces that require strong task lighting with a touch of ambient light, such as conference rooms, kitchens, or commercial spaces.

Semi-Indirect Lighting

60-90% upward, 10-40% downward

Semi-Indirect Lighting

Most light is directed upwards for indirect ambient lighting, while a smaller portion is directed downwards.

Semi-Indirect Lighting

Primarily indirect, but with a bit of downward illumination for balance.

Semi-Indirect Lighting

Advantages:

• Creates a soft, glare-free environment while still providing enough light for general tasks.

• The downward light helps prevent the space from feeling too dim.

Challenges:

• May not be suitable for environments that require intense task lighting, as the downward component may be too weak.