On Fluorescent Photometry

A Study of Near-Field Indirect Lighting Calculations

“…Since a coated metal halide lamp was used in this luminaire, the Distance perpendicular to lamp axis (ft) . 5 1 amount of lamp seen from die analysis point would have a significant effect on the measured illuminance.…”

“…The rule is generally applied to calcula tions and measurements alike Levin has stated, however, that the rule was developed for sources With a Lambertian distribution, and a 1 percent deviation may not be accurate for luminaires that have a nonLambertian distribution. 5 Regardless of the distribution, for calculations in in terior environments, most luminaires cannot be con sidered as point sources, and one of the two area source algorithms discussed above is usually im plemented. These can be thought of as the current state-of-the-art in near-field calculations.…”