Abstract
Previous studies of spatial brightness have been carried out using a variety of visual fields, these ranging from a flat, uniform, neutral surface to interior spaces containing coloured surfaces and objects. It may be expected that this would affect judgements of spatial brightness under lamps of different spectral power distribution. This article presents the results of side-by-side brightness matching tests carried out using four different visual fields. It is concluded from interpretation of these data and results from previous studies that the presence of coloured objects or surfaces in the target field does not significantly affect the outcome of brightness matching trials.
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