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.
There is some confusion about this because compact fluorescent light bulbs (or CFLs) have typically been referred to as 'low energy light bulbs' by retailers. However, the reality is that there are a number of different kinds of low energy light bulbs available, including CFL and LED light bulbs. Just to make things more confusing, some rather inefficient lighting products, such as traditional incandescent and halogen bulbs, come in 'low energy' versions.