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.
Norasit Kaewsai/iStock/Getty Images. 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.