Types of Artificial Light
Artificial light is a form of visible energy created by humans to brighten dark spaces, work at night, or send signals. Unlike sunlight, which is natural, artificial light comes from sources like incandescent bulbs, fluorescent tubes, LEDs, and lasers. Each of these types works in different ways and uses energy differently. Scientists and engineers design these lights by understanding how light waves behave, how energy is used, and what materials give off light best. Learning about artificial light helps us understand how light can be produced and controlled in useful ways.
Science and Engineering Practices (SEP): Developing and Using Models
To explore artificial light, scientists and engineers create models to show how different types of lights produce energy and what makes them unique. A model might show how an LED uses electrons moving through a material to create light, or how gas inside a fluorescent bulb glows when electricity passes through it. These models help us predict what kind of light will be brightest, most energy-efficient, or last the longest. In school, you can make simple models to show how light sources work and how electricity turns into visible light.
Activity Ideas:
- Light Bulb Model Creation – Build models that show the inner parts of an incandescent, fluorescent, and LED light and explain how each type produces light.
- Energy Efficiency Poster – Create a visual comparing how much energy each type of artificial light uses and what that means for everyday use.
Crosscutting Concepts (CCC): Structure and Function
Artificial lights work because of their structure. Inside a light bulb, the way wires, gases, and other materials are arranged allows it to give off light when electricity flows through. The materials are chosen based on what they need to do—some glow when heated, others glow when energized by electricity. The shape of a bulb or LED also affects how light spreads out into a room. By designing the right structure, engineers can make lights that are small, bright, long-lasting, or even colorful.
Examples:
- Structure: A thin wire (filament) in an incandescent bulb heats up until it glows.
Function: It produces warm, steady light but uses a lot of energy. - Structure: A layer of special material in an LED converts electric current into light.
Function: It produces bright light efficiently and lasts a long time. - Structure: Fluorescent tubes contain gas and a coating that lights up when electricity passes through.
Function: It makes a wide, cool light that works well in large areas.