Types of Artificial Light Sources
An incandescent bulb consists of a filament that glows when electricity is passed through it.
A halogen lamp is a type of incandescent lamp where high-pressure halogen gas is inside the bulb allowing the filament to burn hotter and longer.
This technology passes electricity through a gas, which excites the gas and causes it to glow. Fluorescent, high-intensity discharge lights (HID) and low-pressure sodium lights use this technology. HID lamps use different gases to produce light:
- Mercury Vapor
- Metal Halide
- High Pressure Sodium
|Metal Halide||Fluorescent Tube||Compact Fluorescent Light|
These types of lights require a ballast, which is a device that starts the lamp and regulates its operation.
LED’s are the newest type of artificial light and were born out of the electronics and computer industry. An LED is a tiny electronic device that emits light.
|Red LED||Green LED||Blue LED|
|RGB LED||White LED|