wunder beta📘 Filaments glow hot; LEDs emit in silicon
An incandescent bulb mostly makes infrared. An LED junction releases photons when charge recombines.
What you’ll learn
- Inside the LEDContrast filament heating with semiconductor emission and explain phosphor white light.Recombination at the junction makes colored photons. White bulbs usually mix blue emission with phosphor conversion.
- Driver and efficiencyDescribe drivers, lumens per watt, and why heat sinks still matter.Current must be controlled. Efficacy compares visible output to input power; junction temperature affects life.
- Optics and lifetimeExplain beam shaping, lumen maintenance, and how to read packaging claims.Small emitters enable optical control. LEDs often fade rather than snap; labels separate lumens, watts, and color.
Questions this course answers
What produces light inside an LED?
Current drives electrons and holes together in the junction, where recombination can release energy as photons.
Why does a white LED bulb often use a phosphor?
Phosphor conversion broadens the spectrum from a narrow-band LED so the combined light appears white.
What does a bulb driver mainly do?
The driver regulates and converts the input so the LED receives a safe, useful current.
Why does thermal design affect LED lifetime?
LED chips and their surrounding materials age faster when operated at higher temperatures.
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