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The Influence of the Floor Cavity: A Block to Energy Efficient Lighting Design Geoffrey K. Cook Sarah Hill University of Reading, UK Summary There is a need for designers to be able to quantify the effects of abstractions within interiors in order for energy efficient lighting schemes to be proposed. The results shown in this paper suggest that the traditional methods of quantifying the influence of obstructions within the floor cavity require re-examination. The horizontal illuminance at the base, mid-height and mouth of a floor cavity in a series of interior is measured. Following the introduction of a range of obstructions the horizontal illuminance is remeasured. When illuminance is compared to the effective reflectance of the mouth of the floor cavity significant differences are seen to exist. This questions the validity of the method of predicting the effective reflectance of the floor cavity. A need for further work to determine the effect of horizontal obstructions and to produce a theoretical model for use by lighting designers is identified. Back to Right Light Proceedings startpage Top of page