A preamble is usually used for formal documents; you wouldn't include one in a text to your best friend. noun-A preliminary statement, especially the introduction to a formal document that serves to explain its purpose. noun-An introductory occurrence or fact; a preliminary.
Halogen bulbs produce a bright white light. They become much, much hotter than other types of bulbs and should not be used near combustible materials or touched during or shortly after use. Fluorescent: These tube-shaped lights are often used as overhead lighting for large areas such as retail stores or home basements.
The bulbâs brightness, measured in lumens, and a disclosure for bulbs containing mercury will also be printed on each bulb. Incandescent Bulbs. Incandescent bulbs are the original type of bulb as designed by Thomas Edison. They produce light when an electric current passes through a filament and causes it to glow. Inexpensive and widely available, they are the most commonly used bulbs today, but are being replaced by more energy efficient choices.