{"references": ["[1] Fotios, S. 2011. Lighting in offices: Lamp spectrum and brightness. Coloration Technology, 127, 2, 114-120.\n[2] Berman, S.M., Jewett, D., Fein, G., Saika, G. and Ashford, F.\n1990. Photopic luminance does not always predict perceived room brightness, Lighting Res. Technol., 22, 1, 37-41.\n[3] Davis, R.G. and Ginthner, D.N. 1990. Correlated color temperature, illuminance level and the Kruithof curve. J. Illum. Eng. Soc., (Winter 1990), 27-38.\n[4] Fotios S and Houser K. 2009. Research methods to avoid bias in categorical ratings of brightness. Leukos, 5, 3, 167-181.\n[5] Fotios, S.A., Houser, K.W. and Cheal, C. 2008.\nCounterbalancing needed to avoid bias in side-by-side brightness matching tasks. Leukos, 4, 4, 207-223.\n[6] Logad\u00f3ttir, \u00c1., Christoffersen, J. and Fotios, S.A. 2011. Investigating the use of an adjustment task to set preferred illuminance in a workplace environment. Lighting Res. Technol., 43, 4, 403-422.\n[7] Atli, D. and Fotios, S. 2011. Rating spatial brightness: Does the number of response categories matter? Ingineria. Iluminatului, 13, 1, 15-28.\n[8] Vienot, F., Durand, M-L. and Mahler, E. 2009. Kruithof's rule revisited using LED illumination. Journal of Modern Optics, 56, 13, 1433-1446.\n[9] Boyce, P.R. 1977. Investigations of the subjective balance between illuminance and lamp colour properties. Lighting Res. Technol., 9, 11-24.\n[10] Fotios, S.A. and Cheal, C. 2011. Predicting Lamp Spectrum Effects At Mesopic Levels. Part 1: Spatial Brightness. Lighting Res. Technol., 43, 2, 143-157.\n[11] Fotios, S.A., and Levermore, G.J. 1998. Chromatic effect on apparent brightness in interior spaces, II: SWS lumens model. Lighting Res. Technol., 30, 3, 103-106.\n[12] Rea, M.S., Radetsky, L.C. and Bullough, J.D. 2011. Toward a Model of Outdoor Lighting Scene Brightness. Lighting Res. Technol., 43, 1, 7-30.\n[13] Houser, K.W., Tiller, D.K. and Hu, X. 2004. Tuning the fluorescent spectrum for the trichromatic visual response: a pilot study, Leukos, 1, 1, 7-24.\n[14] Hunt, R.W.G. 1995. Measuring Colour. Second edition.\nEllis Horwood, London."]}

Light sources are available with a wide variety of spectral power distributions (SPD), which are defined by the relative amounts of optical radiation versus wavelength, within the visible range of approximately 380–780 nm. Previous work has demonstrated that SPD influences perceived brightness of room interiors (or, spatial brightness) in a manner that is not predicted by photometric quantities that are derived from the Standard Photopic Observer. The ability to change the impression of spatial brightness through careful variation of lamp spectrum provides a route to acceptable reduced illuminances in offices [1] and thus potentially to energy savings, but we are not yet able to identify the spectral characteristic that best correlate with impressions of spatial brightness. Over 70 past studies of SPD and spatial brightness have been reviewed with the objectives of firstly identifying studies that give reliable evidence of the effect and secondly identifying the trends found. This record was migrated from the OpenDepot repository service in June, 2017 before shutting down.