| 摘要 |
LEDs are considered to be point light sources. Visible light provided by one or more light emitting diodes (LEDs) is passed through a light diffuser. The LEDs and diffuser are mounted inside a transparent or light-transmissive non-evacuated envelope and bulb. The light emitted from the bulb appears to originate from a filament used in conventional light bulbs rather than from a point light source. |
