I'm very satisfied with these bulbs super light and super heat price could be slightly lower but here cheaper than in some Zoogeschäfter! Operate this but not mut the original ECG as they cost three times I use are from Osram much much cheaper and in my opinion better than the originals! Only Connector Connect itself must be made since no coupling exists! Clean and proper work is appropriate here because when you start but by tiles 4.5kV, ignition cables are required between the ECG and lamp! Should be connected by an electrician!