In order to verify the applicability of the discomfort glare evaluation model of small size light source to LED, the discomfort glare is generated by white LED of two kinds of color temperature. The experiment is conducted under four kinds of glare luminance and viewing angles. Observers are asked to give a deBoer rating score under each condition. The results show that lager eccentric angle of white LED leads to lager contrast ratio. Lager glare luminance and smaller eccentric angle lead to higher deBore rating score, namely more discomfort glare. The small size light source model UGRsmall and the position coefficient modified models UGRS1 and UGRS2 are verified experimentally. The results show the high correlation between the calculated value of the model and the subjective experiment of discomfort glare rating. Further, model UGRSa is obtained by adding optimal coefficients of UGRS2 and optimizing them. Model UGRSk is obtained by adding eccentric angle into model UGRsmall and correcting it. UGRSa and UGRSk both have better performance.