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.
Current labeling already helps make the switch from thinking in watts to thinking in lumens. The next three slides show three packages for three different types of A19-shaped light bulbs â incandescent, LED and CFL â that all produce approximately the same lumens. This 40-watt incandescent bulb equals 500 lumens. Photo: Inset from Philips light bulb package.