The hourly global radiation tilt factor for the noon hour was measured for inclinations of 10, 20, 30, 40 and 50 degrees. The tilt factor For each hour was obtained by averaging sets of instantaneous values measured during the noon hour. Again, computation of the tilt factor was made using the Klucher, Hay, Isotropic and Perez models. The Klucher and Perez models appear to give a small overestimation, while the Hay and Isotropic models lead to an underestimation. The standard deviation for all models lie within the range of 0.017-0.064. For a low tilt like 10 degrees, all the models perform similarly, however Perez＇s model gives a marginally better agreement with experiment. For higher tilts, like 30, 40 and 50 degrees, the performance of the Klucher model appears to be the best. As there were obstructions to diffuse radiation due to trees and structures, an attempt was made to discard the horizontal brightening terms considered in the Klucher and Perez models. Under such a field condition, results improve remarkably.