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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Type. The four light bulb types used in residential recessed lighting are incandescent, halogen, compact fluorescent (CFL), and light emitting diode (LED). Incandescent light bulbs are the most common type used among homeowners (for now), despite being the oldest and most inefficient technology.his made it impossible to use an energy-efficient fluorescent light bulb in a standard (non-fluorescent) light fixture. To solve this problem, manufacturers began offering CFL lamps with miniature built-in ballasts and standard screw bases which allowed the bulb to be used in any standard fixture.