Bones, it doesn't say where you looking to mount your lights or if you have a ROPS on your tractor to mount them to. But I mounted 4 PIAA brand fog lamps on my ROPS. 2 face forward, 2 rearward. I used "yellow" fog lamps because I did not want to attract bugs when mowing at night but I found that I use the lights more often in the winter for snowblowing than during the warm weather for mowing.
Because of some concern for voiding a warrenty by drilling into the ROPS, I decided to take a piece of 1.5" by 1.5" angle iron, about 20" long and I drilled the light mounts into the angle iron. The angle iron was epoxied onto the ROPS with a high shear strength, waterproof marine epoxy. The light bar has been in place for almost a year with no signs that it will break loose. The rated shear strength is 5000# and the epoxy only cost about $6 or $7.
The lights were run to a relay so the switches only absorb the power draw of the relay, each switch is fused. I used 2 100% waterproof (submersible) switches that also happen to exactly match the original equipment switches used by my New Holland and Ventrac tractors. I also chose lighted switches, but I don't really see that there was any advantage for that. I only use waterproof switches because the cost difference is minimal. The waterproof switches were about $8 each and I won't ever have to worry about them shorting out in a surprise rain storm or when washing the tractor.
The light bar is mounted to the back of the ROPS, the lights hang under the ROPS. I have a lot of low hanging branches, I wanted the lights protected so the lights actually sit just behind the leading edge of the ROPS and branches seem to get brushed aside, as of yet it works, the lights have not been knocked off by a branch.