The manual says every 5th time
The ADR Rules state that washers and self leveling is mandatory for lights above a certain light output I think it 2000 lumens????
So if your lights are below that they would be legal if not No they arent
I also read they may only be installed in vehicles of which a model has HID as standard.
So you couldnt legally put them in a Mk2 Cortina for instance as no Cortina ever had them.