It's always best to instal a lighting relay and switch the control line to the relay rather than the +v wire. Be sure to put a fuse or breaker in the +v wire near the battery. Many lightbars come with a relay, switch and wire harness ready to go, though you will probably need the wire to the ROPS to be extended.
I have a 32" dual row lightbar from Caliraisedled on my pickup behind the lower grill that puts out a lot of light and is a great deal for the price. Mine uses 60 Osram LEDs, so it draws 300 watts, which is 3 times what a pair of headlights burn, and probably 10 times the light output. It's harsh light, cold and bluish, and probably more lumens than I would want on the tractor where you're not looking to the far distance. There are warmer ones out there, with some or all of the LEDs having an amber lens. You can buy 14" or 22" ones, and Caliraised has a single row amber 150 watt one that looks about right to me for a working light. Get a flood or combo rather than a spot beam light,