I just picked up a 4,500 lumen Craftsman LED work light for this purpose when I detailed my wife's white X5 (I was looking at the next cheaper light but it simply wasn't bright enough). I also wore a Scangrip I-View LED headlamp which was a great tool to have.
2006 S2000 - Berlina Black - PU 10w30, PCX-004
2020 M340i xDrive - Portimao Blue - Dlr Fill, 114...898
2019 X5 xDrive 40i - Mineral White - Dlr Fill, 114...898