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Building Design and Construction Handbook - Merritt - Ventech!

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15.66 SECTION FIFTEEN<br />

FIGURE 15.14 Examples of ceiling-mounted fixtures: (a) opaque-side drum for direct diffuse<br />

lighting; (b) spotlighting with inc<strong>and</strong>escent lamp; (c) direct, widespread lighting with an HID lamp;<br />

(d) fluorescent fixture for direct diffuse lighting; (e) globe fixture with inc<strong>and</strong>escent lamp for direct<br />

diffuse lighting; (ƒ) small diffusing drum; (g) fluorescent fixture for semidirect diffuse lighting; (h)<br />

fluorescent fixture with diffusing lens for direct lighting.<br />

FIGURE 15.15 Examples of pendant fixtures: (a) globe fixture for direct diffuse light; (b)<br />

fluorescent fixture for general diffuse lighting; (c) exposed-lamp fixture for direct lighting; (d)<br />

direct downlight fixture; (e) fluorescent fixture for semidirect lighting; (ƒ) fixture for directindirect<br />

lighting; (g) fluorescent fixture for semiindirect lighting; (h) fixture with high-intensity<br />

discharge (HID) lamp for indirect lighting.<br />

scopic effect of the lamp output caused by the ac power supply <strong>and</strong> to keep the<br />

variation in current nearly in phase with the variation in voltage, thus maintaining<br />

a high power factor.<br />

Fluorescent lamps generally are available as linear, bent U, compact configuration,<br />

or circular tubes, <strong>and</strong> luminaires are designed to be compatible with the selected<br />

shape.<br />

Fluorescent lamps may be classified as preheat, rapid start, or instant start. They<br />

differ in the method used to decrease the delay in starting after a switch has been

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