Also is importat to you explain how to avoid the failure bulb message from the computer, cause they will need to make some easy part to avoid that. Also a 50W is very dangerous for the volvo ECU, cause the first 2-4 seconds the HIDS ballast take 80W of power to start from the factory harness with is made for 75W, and we are talking about 80W from the 35W ballast, the 50W takes like 100W on the start so it can burn something on the car, the ground of the headlight is directly comming from the ECU of the car. Great prices and the hids is amazing, i just want to help you to avoid any problem on the future, we have more than 6 years on the hid market.