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Catalogue Trac Lighting Catalog

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Photometrie Data

The photometric charts on the following pages provide illumination levels (FC) and beam size (in feet) for lamps of various wattages and beam patterns. Data is given for lamps aimed at both horizontal and vertical surfaces.

Maximum candlepower and rated life is also indicated for each lamp. Lamp performance is based on bare lamp photo-metrics provided by lamp manufacturers. Additional information may be obtained from Juno.

A Aiming angle of fixture/lamp, measured from 0°

CBCP Centerbeam candlepower

D Distance from fixture/lamp to wall

FC Footcandles at beam center (aim point)

L Length of beam*

MH Vertical distance from the fixture/lamp to the horizontal surface W Width of beam*

X Vertical distance to the center of the beam measured from ceiling**

*The beam spread In degrees and the beam "L" and "W" In the following tables are computed at 50% of centerbeam candlepower and represent areas of "effective Illumination."

**In vertical aiming applications, aim point (x) is determined by dividing distance from the wall (D) by the tangent of the desired aim angle (A) (0.577 for 30", 1.0 for 45", 1.732 for 60")

Application & Planning

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