Even when I had a mini light bar on my truck, I never used it while mowing. Mainly when backing into driveways on busier roads or pulled over on the side of a road for a short period of time.
Visiblity is important, especially when working along the side of busy roads. I've been debating installing some warning lights on my new truck, just haven't decided what I want to do. My personal truck and work truck are one in the same, I'd rather not have a light bar on the roof, I'm thinking some Whelen TIR3 in the grille and along the side steps and in the rear window.
'07 Chevy 2500HD
2010 John Deere Z925A 54" MOD
2011 John Deere Quik Trak 647A
John Deere walkbehind