Correspondence

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Perez R. , Seals R. and Michalsky J Modelling skylight angular luminance distribution from routine irradiance measurements J. Illum. Eng. Soc. 22(1 Winter) 10-17 (1993)

Kittler R. , Perez R. and Darula S. A new generation of sky standards Proc. Lux Europa Conf pp 359-373 (1997)

Iso 15469/Cie S003 Spatial distribution of daylight—CIE standard overcast sky and clear sky (1997)

Kittler R. , Perez R. and Darula S. A set of standard skies (Bratislava: Polygrafia) (1998)

Kittler R. , Darula S. and Perez R. Advantages of new sky standards: more realistic modelling of daylight conditions in energy and environmental studies Int. J. Energy Eviron. Econ. 8(1) 65-72 (1999)

Steven M.D. Standard distributions of clear sky radiance Q.J. Roy. Met. Soc. 103 457-465 (1977)

Steven M.D. and Unsworth M.H. The angular distribution and interception of diffuse solar radiation below overcast skies Q. J. Roy Met. Soc. 106(1) 57-61 (1980)

Kittler R. and Darula S. Parametrisation and estimation of sky types from global illuminance Lighting Res. Technol. 32 (2000 ) (in press)