LED lamp
device · 2008 · Digital age
A lamp built on white LEDs.
What it is made of
- Blue LED — has part. White light comes from a blue chip and a phosphor.
- Rectifier — has part. The driver in the base rectifies mains current and limits the LED current; in an ordinary bulb it has no transformer.
- Heat sink — has part. LEDs get warm, so the lamp has an aluminium heat sink.
Principles and materials it uses
- Gallium nitride — is made of. The chips are gallium nitride.
- Aluminium — is made of. The radiator is aluminium.
History: what it evolved from and what it influenced
- Incandescent light bulb — evolved from. It replaced incandescent bulbs.