This lamp is what some people call a 4 tube compact fluorescent or sometimes a quad fluorescent.  The lengths of these Dulux D compact lamps was such that the placement in a fixture would be in an ideal position for light distribution.  This was an answer to designers who were looking for a lot of light in a relatively small fixture.  The Dulux D twin tube is a high lumen compact fluorescent which because of its shape can be used in many areas where higher illumination was not possible before. The Sylvania quad tube has been the choice for lighting applications like recessed lighting or other types of commercial lighting. The color rendition on the lamp is very high making it an excellent choice for color sensitive areas. The diameter of the bulb is the T4 and it has either four pins or two pins in a diagonal position.

When it comes to lighting up a home or office, compact fluorescent bulbs tend to be the ones chosen more often than other types of bulbs. They are chosen most often because of the great light output and good color along with energy efficiency as well. When compared to incandescent lighting, these are longer lasting, using much less energy making them a perfect choice for almost any type of lighting. There are several kinds of compact types which include the regular household base, some that are plug-in types and some short linear bulbs. As with all fluorescent bulbs, they rely on ballasts inside of the fixtures or units to make them work. The ballast is important because it is specific for each type of lamp. You can't change from one type of fluorescent to another without changing the ballast in most cases. On a rare occasion, there may be a ballast that is made for several different types such as in the case of some commercial plug-in Sylvania quad tube lamps. Most of the time though the ballast in the lamp are matched electrically and so it's good to make sure the ballast you have is the right one for the lamp you choose.  You'll find these in several wattages down to 9 watt and all the way up to 26 watts.

You can get these in almost any color you want with a warmer 3000K color or the 4100K color more like office lighting. Fluorescent lamps can come in many other colors as well and are identified by their Kelvin temperature. By definition, virtually all are full spectrum in that they contain some of all colors in their spectral range. However, the term full spectrum is primarily used when referring to those lamps that fall into the white to blue/white color temperature range. Color temperature is measured by a term called Kelvin. 3000 Kelvin would be a warm tone color, 5000 Kelvin would be a white color and 6500 Kelvin would be a blue/white color. although there are many choices in color for the Dulux D, it is most commonly found in the 3500 Kelvin or 4100 Kelvin temperature.  The typical office color is usually the 4100 and so it makes sense that these would match up to what the light color is all around the office.

Remember that there are many variations of Sylvania quad tube compact fluorescent light bulbs, we describe some of the most common used in home and commercial lighting here. Keep in mind that we also stock all the larger or linear types of fluorescent lamps used in commercial lighting.  We have a large inventory of fluorescent bulbs for nearly every type of light fixture in the field. If you need help identifying a bulb, our customer service representatives can help you determine what you have.