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.
There are four main types of daylight bulbs listed below, Please Click on the Image of the type that you are after. LED/Fluorescent Daylight Tubes Information. Different types of environment generally require different types of light source and colour. Many employers find it useful to use daylight tubes to illuminate their workspaces, owing to their generous light output, wider spectrum and superior CRI (more on these last two later).