Ben, I find that reflections can be a killer after about 500+m, even just from the scrub.
With the standard lights properly adjusted, plus the 36(?) Cree leds in the lightbar, I can see anything within that range. Easily enough to come to a screaming halt if needs be. The huge angle of the light bar is a big plus.
In my extreme youth, I used to use 100W light aircraft landing lights. Even with a really heavy duty 68 AH battery, they drained it pretty quickly with only a 22A generator pumping it up. I'm talking about the late 1960s ... They reached out about a mile (1.6 kms), but almost no side lighting - so important for roos!