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.
Halogen bulbs can be dimmed in lamps with standard incandescent bulb dimmers, up to a point. Incandescent halogen bulbs produce a bright, white, long-lasting light that shows colors to their best advantage. They last two to five times longer than standard incandescent bulbs.