G'day Rossco.
Thanks for your enquiry.
The amount of light the 40" Aurora LED lightbar emits, will more or less make your other lights non existent. This includes your spotties! At 19600 lumens of light they are amazing.
The use of quality 5w led's and the reflector design gives you an even light all over. Like Darren (MudRunnerTD) said, it is like liquid light.
As for mounting, well there are many ways this can be done. The simplest and tidiest setup would be to run a single rack for the lightbar. If you can find something that sits nice and low it will make for a nice and slimlime setup. Otherwise if the rack sits high enough you have the option to mount the lightbar underneath the rack.
They come with two different sizes for the mounting feet so you will have an option that best suits your needs.
If you have any further questions let me know.
Cheers,
Paul