I got the 9005 H11 LED Headlight Bulbs H11/H8/H16 LED Fog Light Combo which Nilight says are compatible with our 2015 Subaru. They are in terms of size. But a huge number of Subarus, which is a large selling brand, as well as many other makes/models of vehicles, use their HB (high beam) or LB (low beams) as their DLRs (aka "driving lights" or "parking lights") and these will not work properly with them. In our Subaru DLRs are done by simply supplying 1/3 the voltage to the high beam. In a traditional halogen bulb this lowers the light output to 1/3 which is good for DLR. LED headlight bulbs however will have same output of light at 5 volts and 24 volts. Nilight support suggested a resistor, but a major seller of automotive LED should know this does not help since the LEDs are essentially binary: 1) off or 2) on at the same lumens no matter the voltage. That is why if you have a low battery on a halogen equipped car you will see lights brighten when you rev engine, but will not see a change if LED.Also lots of makes and models due to the vehicle's type of reflector. Will see lot of light over the cut off line after installing LED. All Subarus made before those started to come with LED, and LED optimized reflectors, in 2017 will have a lot of diffuse light over the cut-off which is a lousy pattern. We do. We can also see the LED diode pattern.That said, consumer reports rated the 2017 Subarus, with original halogen lights which is what we had, as the worst headlights of all passenger cars in 2017. So these LEDs seemed like an improvement due to the sheer volume of light -- until we realized the pattern was so bad and scattered with LED.After trying these LED, what we went with instead was hacking a set of high beam bulbs by dremmling out a tiny bit of the the plastic in the connector so we could use halogen high beam bulbs in low beams. That gives 60% more light, in an excellent pattern. That is way more light than stock, and a much better pattern than LED. It is also something that no law enforcement nor state vehicle inspection will ever figure out or take you to task for.So for many uses these LEDS are an objective improvement, but for some vehicles they are not.These are certainly worth a try. But take a picture of your lighting 30' from a wall or garage door before and after. If your pattern looks good with LED keep them in.