Abstract
A luminous efficacy algorithm is applied to U.S. Weather Service solar irradiance (SOLMET) data to determine direct and diffuse beam illuminances incident upon the horizontal. SOLMET typical meteorological year (TMY) data is searched and the number of hours in a year for which the total horizontal illuminance exceeds a given level is determined for each of 15 selected illuminance levels and for each of several SOLMET cities. Knowing the transmittance of a skylight, and other important characteristics of the application, the number of skylights required to produce a given average interior illuminance level is calculated for each of the 15 exterior illuminance levels. The result is a table of performance (percent of time the desired illumination level is achieved) versus the number of skylights required.
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