NCIDQ Interior Design Professional Exam (IDPX) Practice Exam

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Which type of lighting device uses solid-state electronics to create light?

Incandescent bulbs
Halogen lamps
Light-emitting diodes (LEDs)
Fluorescent lamps

The correct answer is: Light-emitting diodes (LEDs)

Light-emitting diodes (LEDs) use solid-state technology to create light. This means that LEDs function by passing an electric current through a semiconductor material, which emits light as a result of electroluminescence. This process is efficient and allows for a longer lifespan compared to traditional lighting options. In contrast, incandescent bulbs rely on heating a filament until it glows, halogen lamps are a type of incandescent bulb that employs a halogen gas to increase efficiency and brightness, and fluorescent lamps work by exciting mercury vapor to produce ultraviolet light, which then illuminates a phosphor coating. These traditional lighting methods do not utilize solid-state electronics; instead, they rely on gas emissions or thermal radiation. LED technology represents a significant advancement in lighting due to its efficiency, lower energy consumption, and decreased heat output.