This article describes an empirically derived light loss curve and Total Light Loss Factor (LLFT) for sports lighting applications. An empirical model was developed by comparing the illuminance from initial design computations against measured illuminance, on a point-by-point basis, for 37 sport fields. The study was limited to lighting systems that employ 1500W metal halide lamps with a rated life of 3000 hours. The model, which is based on more than three thousand measurements and an equal number of computed data points, demonstrates that values for LLFT of 0.75, 0.69, and 0.65 are representative of real-world sports lighting applications at 1200, 2100 and 3000 hours, respectively. The model suggests that it would be pragmatic to use a LLFT of 0.69 as part of the design calculations for new sports fields. This recommendation is markedly different from the common practice of using a LLFT of 0.80.
|Original language||English (US)|
|Number of pages||19|
|Journal||LEUKOS - Journal of Illuminating Engineering Society of North America|
|State||Published - Jan 1 2010|
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics