Combine 6 tablespoons olive oil, juice from 2 limes, 4 teaspoons cumin powder, 4 teaspoons turmeric powder, salt, and pepper in a bowl. Place the halloumi strips in a dish, pour the marinade over them, and refrigerate for at least 30 minutes (longer marinating time will develop more flavor).
Heat a grill to medium-high heat. Place the halloumi strips on the grill and cook until browned on both sides to your preference.