Lights on the bullbar, bonnet or roof and why?

Simple thing really although it's been slightly annoying me, When you have a light below eye level, you can see if its a clump or rock in front of you by the shadow cast by your lights, When they're on the roof, you take away the shadow, so why do some people use lights set above the eye-line and not below? (unless you're upside down in a Sportage) and yes I understand some people like to use 'floodlights' like on a football pitch which would mean everyone could see the clump or rock except the driver

Mine are set angled out for a view to either side too ... but they're only just above the eyeline and anything that does cause a shadow is likely to be a bit of a step, anything 6" deep or high I don't consider an issue ...

The problem for me with lower lights is that they can cause long shadows which exaggerate the feeling of driving towards big boulders and tend to emphasise any bouncing, especially in places like Derbyshire or The Lakes with very rocky terrain.

I got a 40 inch light bar on the bonnet, at night it's like driving in daylight, there are another 6 smaller 7 inch bars to go on a roof bar the center two will be angled down just beyond the bonnet, the next outer will be angled higher but more to the side 30 degrees'ish the outer lamps will be angled down and to a rough 45 degree angle to illuminate more to the sides of the truck. I have some smaller single row 7 inch bars that are for reversing.

Lighting in an off road situation can be the difference between killing yourself or driving safely through an obstacle.