Overview of ..
The incandescent light bulb is one of the marvels of civilization.
It was the achievement that made Thomas Edison famous. Unfortunately,
it is a relatively inefficient method of lighting. The Energy
Efficiency Manual has a large group of energy conservation
measures devoted to improving the efficiency of incandescent lighting.
The Note explains how incandescent lighting works, why it is not
efficient, the color spectrum of incandescent lamps, and the color
rendering (CRI) of incandescent lamps. With this background, you
will know where to use incandescent lighting and where to avoid
it. The Note also provides practical information that will help
you select the right lamps for applications where incandescent lighting
The characteristics of incandescent lamps are determined largely
by the filament temperature. The Note explains limitations in filament
materials, especially the properties of tungsten. It explains the
relationships of light output, energy efficiency, color, and service
life to filament temperature.
The Note explains the methods that are used to improve incandescent
lamp efficiency. These include heavy fill gases, such as krypton,
the tungsten halogen cycle, infrared reflecting coatings, and low-voltage
An enormous variety of incandescent lamp types are available. Here
are your choices for wattage, lamp shape, lamp base or socket type,
filament configuration, service life, efficiency and efficacy (lumens
per watt), lumen depreciation, service life, lumen degradation,
and other options. Also, you will learn the naming system for incandescent
lamps, such as PAR lamps, reflector lamps, floodlamps, medium and
mogul bases, and more.