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

HALOGEN INCANDESCENT SOURCES
Small and hot, Halogen sources deliver clean, crisp, easily-directed light that is useful for creating focused shapes of light, accent surfaces and objects or for twinkling use as bare lamps for visual interest.
Called by many names, Halogen, Quartz Halogen, Tungsten Halogen, we are talking about a light source
light sources.
that is essentially a refined version of the basic incandescent lamp. Halogen incandescent sources are named for the halogen gas that they contain and the quartz outer bulb that surrounds their filament. Both of these advancements allow the filament in these sources to operate at a higher temperature. This has the surprising benefit of allowing the source to run more efficiently and also extends the life of the lamp. The other benefit these advancements provide to the designer is a smaller source package which can more easily be focused and directed via optics and reflectors. Figure 8.3 shows the working components with the expected similarities to standard incandescent sources.
Halogen Incandescent sources are basically a refined version of standard incandescent; they offer higher color temperatures described as nearly neutral pale yellow. These lamps offer longer lamp life, greater efficacy, and a smaller package that can be better directed to accent and light specific objects. Halogen incandescent sources are still relatively inefficient. It is
Figure 8.3 The working components of halogen incandescent
worth investigating contemporary ceramic metal
halide (CMH) and LED sources, which have been fashioned into similar lamp shapes to provide similar, “directable” effects at much greater efficacy.
The Properties of Halogen Incandescent Sources:
Initial Cost: Moderate;
Halogen sources are moderately expensive to purchase. This expense comes from the cost of the technology and because they are less common than the standard “light bulb.”