The architecture of light: architectural lighting design concepts and techniques. A textbook of procedures and practices for the architect, interior designer and lighting designer pdfdrive com

Figure 8.6 Common shapes of compact fluorescent lamps.
Figure 8.6.5 Common shapes of linear fluorescent lamps. T-12’s are older technology, T-8’s are the most common, and T-5’s are newer technology.
Fluorescent sources represent an efficient way to produce soft, glowing light akin to the diffuse texture we would get from an incandescent source. They are good for the same diffuse blobs of light and “general” area illuminance. These lamps last an exceptionally long time. Fluorescent lamps require care in specifying because of the variety of color temperatures and color-rendering index values available. It is necessary to specify both CRI and color temperature when using fluorescent lamps.
We most commonly use fluorescent lamps for large, open areas like
classrooms and open office workspaces that need a consistent level of diffuse light throughout. We use fluorescent light to wash up onto ceilings or in slots and coves to wash down walls. Like incandescent lamps, it is difficult to harness the light of these large lamps and focus it as accent light. With the increasing popularity of fluorescent sources, their disposal is coming under scrutiny.
Fluorescent lamps contain a very small amount of liquid mercury. Check with
your local agencies for any special regulations governing purchase, specification or disposal of fluorescent lamps.
Figure 8.7 The working components of high-intensity discharge (HID) light sources.
HIGH INTENSITY DISCHARGE (HID) LAMPS
This high wattage, high output, efficient source ranges in use from streetlights to retail accent. Most notably, they all require some warm-up time and are not easily dimmable.
High intensity discharge lamps represent a large family that includes sources like High Pressure Sodium, Metal Halide, and Ceramic Metal Halide. We will focus our discussion on the Ceramic Metal Halide family, as this technology produces relatively complete color spectrums that are suitable for color critical environments. The technology behind HID sources relies on creating an arc of electricity in
an environment of metal vapor. It is fair to consider HID sources as a compressed
version of fluorescent technology just as halogen sources are a compressed version of standard incandescent. Light from HID sources does not rely on phosphors to translate light, so the light color and rendering capability are products of the blend of metals that make up the vapor in the lamp. All of this occurs in the arc tube of the lamp, as electricity is passed between electrodes. Figure 8.7 shows the components.