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.
Screw-in types can be used in place of incandescents in standard lamp sockets. Available in a wide spectrum of colors. Warm white tones best duplicate the color of incandescents. Today's fluorescent bulbs come in a wide selection of sizes and can produce warm tones of light similar to those of incandescents.
Compact fluorescent lamp ( CFL ) bulbs are extremely energy-efficient light bulbs. These bulbs can save both money and power over incandescent light bulbs. Similar to fluorescent light bulbs, CFLs create illumination by heating a gas, which separates them from halogen or incandescent bulbs.