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Download Handbook of laser technology and applications by Colin E. Webb, Julian D. C. Jones PDF

By Colin E. Webb, Julian D. C. Jones

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30. Ε = Φ/Α = Ι/r2 where Ι is the luminous intensity and Α is the area of incidence. Luminance, L, has the unit cd/m2, and is defined as the amount of light emitted from a unit surface in a particular direction. It is also defined by the formula L = I/A. indb 28 9/29/10 5:35:44 PM Chapter 3 Electrical Incandescent Light Sources T his chapter describes incandescent light sources, which were the first—and even today are perhaps the most important—light-​ producing technology in the market based on electricity.

Regarding the 10% of visible radiation emitted, most of it is in red, giving the white color of the source a warm tone. Incandescent lamps are therefore ideal for creating cozy environments and for applications where very good reproduction of colors is needed. However, they are not an economic solution, since the efficacy is small (not exceeding 20 lm/W) and the average lifetime is around 1000 h. A simple multiplication of the total power of the lamp by the efficacy value gives the luminous flux in lumens.

If the applied voltage is lower than the nominal one, then the lamp temperature might be too low for the halogen cycle to work. At least in this second case, the evaporation rate of tungsten is low enough for blackening not to occur. The halogen lamps compared to ordinary/conventional incandescent lamps have longer lifetimes (2000 h or more compared to 1000 h), higher color temperatures (3000–3500 K compared to 2800 K), and higher luminous efficacies (30 lm/W compared to 20 lm/W). 15. Attention should be paid to avoid impurities on the surface of the lamp, especially fingerprints, which can cause damage to quartz under the hightemperature conditions.

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