Lighting Design Principles and Energy Efficiency

Lighting

The foundation of architectural buildings that can change the perception of space, the shape, textures of materials and improve their aesthetic features.

Artificial Lighting

Lighting that is commonly planned at the later stages when the design is completed.

Lighting Design

The application of lighting, including daylight when specifically used as a source of lighting, to human spaces.

Illumination

The distribution of light on a horizontal surface; the purpose of all lighting is to produce ____________.

Lumen

A measure of visible light energy; a 100-watt incandescent lamp emits about 1600 _____.

Watts

A measure of energy consumption; a 60-____ bulb consumes 60 _____ of energy.

Footcandle

A measurement of the intensity of illumination; one lumen distributed over a 1-square-foot area.

Light Output

The most common measure of this is the lumen; light sources are labeled with an output rating in lumens.

Light Level

Light intensity measured on a plane at a specific location, called illuminance, measured in footcandles.

Brightness

A measurement of light called luminance, which measures light leaving a surface in a particular direction.

Glare

The excessive brightness from a direct light source that makes it difficult to see what one wishes to see.

Color Temperature

The color of the light source measured in Kelvin (K); higher Kelvin temperatures are considered cool and lower temperatures are considered warm.

Color Rendition

Color quality, or how colors appear when illuminated by a light source, measured by the Color Rendering Index (CRI) on a scale of 1-100.

Ambient Lighting

Provides general illumination indoors for daily activities, and outdoors for safety and security.

Task Lighting

Facilitates particular tasks that require more light than is needed for general illumination.

Accent Lighting

Draws attention to special features or enhances the aesthetic qualities of an indoor or outdoor environment.

Efficacy

The ratio of light produced to energy consumed, measured as lumens produced divided by the rate of electricity consumption (lumens per watt).

Lumens to Watts Conversion Chart

A chart that shows the lumens produced by different types of bulbs at various wattages.

Determining Target Light Levels

Selecting the appropriate type and quantity of lamps and light fixtures based on fixture efficiency, lamp lumen output, and other factors.

Lighting Design Principles

Guidelines for improving lighting, including focusing on frequently used rooms, replacing existing fixtures, and layering lighting.

Layer Lighting

Designing ambient, task, and accent lighting to produce dramatic effects.

Concealed Light Sources

Light sources that are hidden from view to create a more aesthetically pleasing lighting effect.

LED Bulbs

Energy-efficient bulbs consuming 18% less electricity.

Light Source Limitation

Use only 5-, 9-, and 15-watt LED lights.

Lighting Controls

Devices ensuring lights are used only when needed.

Daylight Optimization

Natural light reduces eyestrain and headaches significantly.

Natural Light Challenges

Cloud cover, heat, and glare affect indoor lighting.

Optimized Windows

Windows that adjust tint to reduce glare.

Energy Conservation

Switching to LEDs saves energy and costs.

Electroluminescence

Process generating light through electric current in LEDs.

LED Lifespan

LEDs last up to 25,000 hours compared to 1,000 hours for incandescent.

Heat Output

LEDs produce less heat, maintaining comfortable temperatures.

Dimmable Lighting

LEDs offer flexible color and brightness options.

Luminaires

Light fixtures including recessed and pendant lights.

Direct Glare

Bright light source contrasts sharply with surroundings.

Reflective Glare

Glare from surfaces like glossy paper and screens.

Physiological Effects

Different light colors affect mood and behavior.

Wireless Lighting Control

Remote systems allow flexible light management.

Occupancy Sensors

Automatically turn lights on/off based on presence.

Lighting of Faces

Proper lighting enhances visibility in presentations.

Cost of Implementation

Includes equipment, installation, and maintenance expenses.

Installation Process

Requires licensed electricians for safe setup.

Maintenance

Regular upkeep ensures longevity of lighting systems.

Energy Use Chart

Illustrates cost per hour for different bulb types.

Ambient Light Level

General lighting level in a space, varies by function.

Indirect Lighting

Light reflected off surfaces to reduce glare.

Matte Surfaces

Help minimize reflective glare in workspaces.