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.
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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.