These bulbs have gone into our 2013 Subaru Outback as the high beam bulbs. Performance-wise, the difference from the halogen is stunning to say the least. Since the low beam is still halogen in this vehicle (it is a massive pain to replace the low-beam bulbs in this-gen Outbacks), it is almost scary to switch back to the low beam because it feels as though the world turns pitch-dark then. To put it another way, these Alla Lighting D-CR bulbs allow you to see SO much more during nighttime driving that there is no going back to the halogen. Not a chance after this experience.
Why, then, have I not given this product the perfect five-star rating? Well, while the performance definitely gets the '5,' the installation was a '3' almost nearing a '2.' First, the D-CR bulbs put up a lot of resistance going into the headlight sockets, so much so that I thought at first that I had bought the wrong size and then that maybe Alla Lighting had packaged a wrong pair of bulbs. In the end, the bulbs did go in and get seated properly, but this part was not as easy as it should have been.
What became really challenging was that, when one of the bulbs was being inserted and turned clockwise to get it seated, the lighting unit came loose from the base. In other words, the base went partly in and stopped while the lighting unit kept turning, making itself a loose piece. Because these two units got separated, I could not get the base to come out of the headlight socket because the loose lighting unit did not generate enough torque to turn the base counterclockwise (or otherwise). The only way to fix this situation was to force the base to come out of the socket in order that the lighting unit be screwed back on to the base, which you cannot do unless the base is outside of the headlight socket.
In our car, because of the tight space the only way to get at the stuck base was unfortunately to remove the battery, which was done. We then used a screwdriver to turn the base inside the headlight socket, took it out, and then screwed in the lighting unit to the freed base nice and tight with the included wrench. The 'nice and tight' should have happened at the factory, but it obviously did not. Thus we expended a lot of time and sweat. And with the sweat went down the fifth star for this review.
(An important lesson: Before installing these bulbs, use the included wrench to make sure that the lighting unit and base are tightly screwed together)
Just to reiterate, the performance level is unbelievable in these D-CR bulbs, and we would certainly buy them again on that basis. Due to the above-mentioned installation snags, however, we just cannot give it a 5-star rating.