500 feet is what I was taught but different areas have different rules. You may have to check with the DMV or the PD about this.
at least 2m
500 to 1000 ft.
according to Florida handsbook, you must dim your bright headlights within 300 feet of the vehicle ahead.
If you are a courteous driver, you will dim them when you see their tail lights. No one likes bright lights in their mirrors, reflecting into their eyes.
The law in most states is between 300 and 350 feet. Personally I do it as soon as I can see the tail lights simply because it bugs the heck out of me when someone comes up on me with their bright lights on.
If you are driving with your bright lights on and can see an approaching vehicle, you should turn off your bright lights immediately.
Although the lights should be dipped when approaching another vehicle so they aren't bright, the best place to look would be at the edge of the road on your side; you will still be able to see most of what is on the road ahead of you, but without looking directly at the bright lights.
As soon as the on coming traffic comes into view.
It is safe to use the bright [highbeam] headlights when there is no oncoming traffic/drivers who could be blinded by the bright light. Also, it is unsafe to use highbeams when there is fog or smoke which would reflect the light back to you, thus reducing the distance which you can see.
Headlights have two filaments, one for dim, one for bright. From your description it appears that one of the high beam filaments is burned out. Replace the bulb.
Low-beam headlights that are not property adjusted can make them as bright as high-bead headlights. They also can cause you to not see the full road ahead.
Because the lights are so bright