which bed lights?

im looking to add some bed lighting, it is impossible to see under my tonneau cover at night, looking at rigid industries A series flush mount lights but i can get them in either 200 or 400 lumens, im thinking 4 lights, 2 on either side. would the 200 lumen ones be enough? it is a 5 foot bed. http://www.rigidindustries.com/category-s/199.htm