Editorial: The next generation of lighting calculations
Abstract
It’s been 100 years since Gibson and Tyndall formally proposed the values that were standardized a year later as the CIE spectral luminous efficiency function for photopic vision, V(λ). The 1920s was a decade when several new computing machines were introduced, but before the first introduction of modern electronic computers in the 1940s. Calculations involving the nascent lumen were likely done by hand and were then at the forefront of lighting science. By the 1960s, methods to calculate average horizontal illuminance, such as the zonal cavity method, were available and the subject of scientific research to understand error levels and extend applicability to new situations. With the increasing availability of personal computers in the 1980s and 1990s, new lighting software based on ray tracing models, radiosity models or a combination was introduced to ease the burden of computing lighting quantities, extend computational capabilities to a much wider range of applications and offer rendered images. The performance of lighting calculation software has continued to improve, and in the last several years, it has begun to include better modelling of spectral quantities as well. There’s still room to improve the speed, accuracy and utility of lighting calculations, and the five articles in this issue all relate to this aspect of lighting research. Yoshizawa et al. present a new model for spatial lighting calculations and visualizations, Photon Flow, which focuses on the light…
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