I need to be educated on LED's.how did you determine what amount of light is sufficient?
Just keep adding lights until it's light enough to not be scared of the dark!!
All kidding aside, what one person deems sufficient may not work for others. When racking on lights tho, keep in mind power draw(only becomes an issue with big monster LEDs)
White light is a good general light for general night driving. Amber works better in low visibility situation such as snow, fog, or crazy dusty. Something to do with the amber light cutting through and not reflecting off the snow/dust/fog as much. Most light manufacturers accept clip on filters now, so no need to fret over white or amber!
As for beam selection, spot will project further down the road or trail, but just down the road or trail. Flood will light up more around you, but not as far ahead. Spot is great for fast travel speeds, as you can see what will be coming up sooner. Flood is great if you need to see the sides of the trail. Again, more companies are making combo light bars, with a spot sense array in the centre, and flood type lenses on the sides, to do each job respectably.
Up here, 60% of all vehicles(yep, even gramma in her camry) run an led bar. come winter its dark 14hrs a day, and moose are surprisingly indistinguishable from trees without heavy illumination. being most are used on highway as a fog/aux light, spot is a common pattern. Us that use the resource/gas field roads, get a spot flood combo.
hope it helps!! Good Luck!!