10 Dec, 12:23
Ireland's John Lacey will referee his first ever RBS 6 Nations while Alain Rolland is also included in the Elite Panel in what is his last season.
The 13,132-strong crowd watched Leinster take the early initiative with out-half Jonathan Sexton kicking two first half penalties.
A converted try followed from Gordon D'Arcy and while Sexton tagged on a late penalty, that strike was sandwiched by an Andrew Trimble try and four vital kicks from Humphreys, including a trademark drop goal, as Ulster ended a run of three league defeats.
For photos of Friday's Magners League meeting between Ulster and Leinster, please click here.