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Since the 1970s there have been major advances in lighting equipment and lighting design calculations. The equipment advances are evidenced by the giant leaps in equipment and system efficacies. Design calculations not only provide point-by-point illuminance and luminances in a space but can provide the metrics for a furnished space and display a colored image of the design. The most difficult aspect of illumination has been the lack of describing and quantifying glare, comfort based, illumination levels and other 'lighting quality' parameters on a sound scientific basis. It is only with a monumental research effort in this latter aspect that advances can be expected. [ABSTRACT FROM AUTHOR]