A skylight test facility is in operation on the roof of the engineering building at the University of New Hampshire. Intensity distribution data for 18 skylight dome-well combinations have been taken for clear and overcast skies and a wide range of solar altitudes. These data are used in two ways: to calculate coefficients of utilisation for skylight systems so that these systems may be treated in the same manner as ceiling-mounted electric luminaires; and to compare skylight systems on the basis of dome transmittance, dome diffusion, dome height-to-width ratio, well reflectance, well angle, well height-to-width ratio, and direct sun shielding.
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