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 8.1 The working components of standard incandescent light sources
Temperature requirement: Some electric light sources have particular temperature concerns. Many fluorescent sources function poorly in cold environments and more efficiently in warm environments.
Heat Generated: Electricity in a light source not converted to visible light is often converted to heat, which must be considered for safety concerns and for additional cooling load needs.
Noise Generated: Beware that many electric light sources and their accompanying equipment (drivers, ballast, transformer) can generate unwanted noise. This awareness and consideration is crucial for interior environments.
STANDARD INCANDESCENT SOURCES
Cheap, hot and inefficient; standard incandescent lamps are used for soft, diffuse blobs of warm light that render colors well.
Standard Incandescent sources represent a very basic technology that has changed little in the 100-plus years since its refinement. Figure
8.1 illustrates the basic
working components that enable these sources to
function. Very simply, electricity is passed through an engineered metal filament.
As with many materials, the metal filament “resists” the flow of electricity. This resistance causes friction, which, in turn, becomes heat. Once this resistance and subsequent heat become great enough, the metal filament “incandesces”; it gives off radiant energy in a broad spectrum that includes the visible spectrum.
Understanding that the radiant energy given off also includes a huge quantity of
heat (infra-red radiation) explains many of the undesirable properties and inefficiencies of incandescent sources. It is worth noting that many countries have introduced legislation to phase out the use of incandescent light sources: The European Union in 2009, Russia and Canada in 2012, The US and China in
2014. Check with local and national regulations before considering these sources for use on your project.