Piston Broke,
You should try marshalling an aircraft with it's lights on - either nosewheel lights or wing mounted lights!!! It makes your job near impossible, especially on a wet night with the light reflecting off the tarmac. The company I work for usually turn taxi lights off when making the final turn onto the apron from the taxiway. If you need the taxi light on in a well-lit apron area, perhaps you shouldn't be flying!
TL