Interior Lighting for Designers

In addition to the four rare-earth phos- phors, the RE-90 3000 K lamp has filters to reduce the quantity of blue light caused by ...

tube is called thewindow.Intensity of light emitted through the window is significantly increased; total light output is reduced ...

color temperature is often used to simulate the color of standard incandescent lamps; 3000 K is compatible with tungsten-halogen ...

lumen output from a small package, they are frequently used in recessed luminaires that resemble familiar incandescent down- lig ...

fluorescent lamps, but offer a means of easily increasing the efficiency of an incandescent luminaire. Light output During the f ...

States were T12 bulbs with less expensive phosphors and poorer color rendering. The combination of high efficacy and good color ...

(1) mercury vapor, (2) metal halide, and (3) high-pressure sodium lamps. HID lamps consist of an arc tube enclos- ing two electr ...

trodes, which lessens the darkening of the arc tube. As a result, pulse-start lamps pro- vide better lumen maintenance, longer l ...

Figure 7.14HID lamp shapes at one-half actual size. ...

H mercury vapor lamp (Hstands for forhydrargyrum, the Greek word for mercury and the source of its chemical symbol Hg) M metal h ...

Light Output Depreciation in light output during life occurs mainly because of the escape of electron- emissive material and tun ...

lumens per watt—but their extremely narrow spectral range makes these lamps unsuit- able for use in interiors (color plate 26). ...

Auxiliary Equipment 8 All discharge sources and low-voltage incandescent sources require the use of auxiliary equipment to suppl ...

tiveby nature. Magnetic transformers are relatively large and heavy. Properly sized for the lamp load, they have a long life exp ...

at which it is designed to operate, not the wattage at which it will operate. Therefore, it is impossible to reduce the wattage ...

inductive ballasts, the overall power factor is 50 to 60 percent. With a capacitor, the lead- ing current drawn by the capacitor ...

produced by the lamp-ballast combination; the input watts are an indication of the power consumed. For example, a ballast with a ...

output as it is measured is different from light perceived by the eye. See page 143.) For four-pin compact fluorescent lamps (T4 ...

Light Control Directional sources, commonly called reflector lamps, such as AR, MR, PAR, and R lamps, have built-in optical syst ...

Light is reflected from each point in all direc- tions, with maximum intensity perpendicular to the surface (figure 9.3). Sand o ...