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Questions and Answers
Incandescent lights produce light by heating a metal ______ until it glows.
Incandescent lights produce light by heating a metal ______ until it glows.
filament
The ______ flux is the total amount of light emitted by a source, measured in lumens (lm).
The ______ flux is the total amount of light emitted by a source, measured in lumens (lm).
Luminous
Decorative lighting is used for ______ purposes, such as string lights or lanterns.
Decorative lighting is used for ______ purposes, such as string lights or lanterns.
aesthetic
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Study Notes
Types of Lights
- Incandescent Lights: Produce light by heating a metal filament until it glows.
- Examples: traditional bulbs, halogen lamps
- Fluorescent Lights: Use electricity to excite a gas, which produces light.
- Examples: tube lights, compact fluorescent lamps (CFLs)
- LED Lights: Use semiconductors to produce light.
- Examples: light-emitting diodes (LEDs), LED strips
- Halogens: A type of incandescent light that uses a halogen gas to extend lifespan and efficiency.
- Examples: halogen lamps, quartz lamps
- Neon Lights: Use electrified glass tubes filled with neon or other gases to produce light.
- Examples: neon signs, decorative lighting
Light Properties
- Luminous Flux: The total amount of light emitted by a source, measured in lumens (lm).
- Luminous Intensity: The amount of light emitted by a source in a specific direction, measured in candelas (cd).
- Color Temperature: The color appearance of light, measured in Kelvin (K).
- Examples: warm white (2700K-3000K), cool white (3500K-4100K), daylight (5000K-6500K)
Applications of Lights
- Task Lighting: Lighting used to illuminate a specific area or task, such as reading or cooking.
- Ambient Lighting: Lighting used to create a general atmosphere or mood, such as in a living room.
- Accent Lighting: Lighting used to highlight or draw attention to a specific object or feature.
- Decorative Lighting: Lighting used for aesthetic purposes, such as string lights or lanterns.
Types of Lights
- Incandescent lights produce light by heating a metal filament, examples include traditional bulbs and halogen lamps.
- Fluorescent lights use electricity to excite a gas, producing light, examples include tube lights and compact fluorescent lamps (CFLs).
- LED lights use semiconductors to produce light, examples include light-emitting diodes (LEDs) and LED strips.
- Halogen lights are a type of incandescent light that uses a halogen gas to extend lifespan and efficiency, examples include halogen lamps and quartz lamps.
- Neon lights use electrified glass tubes filled with neon or other gases to produce light, examples include neon signs and decorative lighting.
Light Properties
- Luminous flux measures the total amount of light emitted by a source, measured in lumens (lm).
- Luminous intensity measures the amount of light emitted by a source in a specific direction, measured in candelas (cd).
- Color temperature measures the color appearance of light, with examples including warm white (2700K-3000K), cool white (3500K-4100K), and daylight (5000K-6500K).
Applications of Lights
- Task lighting illuminates a specific area or task, such as reading or cooking.
- Ambient lighting creates a general atmosphere or mood, such as in a living room.
- Accent lighting highlights or draws attention to a specific object or feature.
- Decorative lighting is used for aesthetic purposes, such as string lights or lanterns.
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