Extending the lighting design objectives procedure for holistic lighting solutions

Abstract

The author has previously proposed a novel spreadsheet-based lighting design objectives procedure (LiDOs) that enables practitioners to reconcile interacting LiDOs relating to the spatial distribution of illumination within a space, and this procedure has been successfully adopted by several lighting design practices. This paper proposes that the procedure is developed into an extended computer-based lighting design tool (LiDOs2) that includes LiDOs relating to spectral and temporal illumination distributions, as well as spatial distribution. This would enable regulators to specify limiting values for basic indoor lighting objectives such as perceived adequacy of illumination while at the same time guiding practitioners to incorporate LiDOs that address characteristics of lighting chosen to suit specific applications. The LiDOs2 procedure would be capable of generating holistic lighting performance specifications that would enable practitioners to conduct informed searches for light sources and luminaires, and to determine layouts and control circuits with confidence that the specified combination of LiDOs would be achieved.

Indoor lighting standards and their role in lighting practice

“…Performance specifications for lighting installations related to specific applications could be routinely obtained by application of the LiDOs procedure. In its present form, this comprises a DFD but proposals are in hand to extend the specification to include spectral and temporal flux distributions, 24 which could include recent proposals for circadian effects of lighting. 25 It may be noted that the sequence of the LiDOs procedure is the reverse of current calculation procedures.…”

“…Meanwhile, more information on the procedure, including a worked example of the spreadsheet and a bibliography, can be accessed through Cuttle. 19…”

“…To make the required paradigm shift in lighting practice it is not enough to only change how standards are specified, it will also be necessary to replace the lumen method with something more comprehensive and flexible. The LiDOs procedure, [16][17][18][19] which develops the required light distribution to achieve the chosen objectives of the scheme before selecting suitable light sources and luminaires, is an example of the type of procedure needed to replace it. Depending on the lighting design objectives chosen, the procedure will guide a practitioner towards a simple solution for a simple problem or enable detailed exploration of interacting objectives for a complex problem.…”

Assessments of Mean Reflectance Surface Exitance and Contrast in a Museum: Comparison Between Simulation, Calculation and Field Measurements

“…values, while the result of the target illuminance on each surface is presented in the list of TAIR values[23],[24].…”

An introduction to LiDOs

“…However, instead of the luminance-related brightness concept that Waldram used, I chose spatial brightness 3 for specifying overall impression, and John Lynes’ constancy-based approach 4 for visual emphasis. These concepts formed the basis of the LiDOs Procedure, 5 and from there on, as they say, the rest is history.…”