+1. You are potentially blinding other drivers, which could lead to an accident. wouldn't want to be the cause of an accident with people being as sue happy as they are now-a-days. Best thing to do for clearing hydrants if you have a flat bed is to mount a light to the bed facing sideways. Pull up parallel to the hydrant and then turn the work light on. As soon as you're done, turn it off.Not sure why you think he's being a problem to you.
4 white lights pointing backwards, shining in oncoming drivers' eyes. He was right, you are creating more of a hazard than you're attempting to prevent.
Pretty sure you're not going to find a state in the union that allows white rear facing work lights.
As for use of amber lights, amber lights are to be used as a signal to proceed with caution. Which means, like Oomkes has now said several times, they are only to be used when operating in a manner that is not in compliance with regular road rules. If you're actively in the process of snow removal, they need to be on. If you're driving from account to account they need to be off. Just like the rear facing white lights, amber lights that are on for no reason can also be considered a hazard to other drivers because 1) you are not using the lights in the manner that they are designed and 2) we do most of our work at night. However, that means in conditions such as white out conditions with limited visibility, it is acceptable to use the lights.
This isn't rocket science. And the officers are doing their job. If you're breaking even a stupid amber light law, they are still enforcing it. Unless you know anything about police strategies, I would not start with the "they have real criminals to catch" bull crap.