Ulster came from behind to beat the Lions 24-17 at a windswept Kingspan Stadium scoring three tries to the visitors' two in game which was in the balance throughout.
Edinburgh claimed a fourth victory from five starts in the United Rugby Championship (URC) when they battled to a 31-23 victory against the Bulls at Hive Stadium.
The Lions face Irish outfit Ulster for their final tour match in Round 5 of the United Rugby Championship. Kick-off is at 21:35 on Friday evening at Kingspan Stadium.
The Bulls focus on Edinburgh as the league leaders look to complete their European travels with another successful showing in the United Rugby Championship.
Flyhalf Jean-Luc du Plessis is determined to make the most of every minute he gets in a Stormers jersey.
The Stormers became the latest victim of the undefeated Benetton in their United Rugby Championship clash, with the Italians winning 20-17 at Stadio Monigo.