LED flood lights for truck?

 
  http://www.amazon.com/1260lm~1800lm-waterproof-Driving-Off-road-Vehicle/dp/B00OLOBFVO/ref=sr_1_8?ie=UTF8&qid=1431711284&sr=8-8&keywords=cree%20led%20automotive%20lights&tag=viglink20561-20

  Anyone using these lamps?  I'm curious as to how much light and area they will illuminate.  If they light up a large area say 15-20 feet from truck I'd like to add a set to my campershell to aid in setting up camps after dark.

If you pull the trigger on a set of these, let me know how they work out .... I too would like to mount some lights on my truck rack & some on my camper trailer for setup.