Task Lighting in an Open Office Area

I am try to see what modifications our team can make to comply with the IEQc6.1 Controllability of systems lighting LEED credit. Right now we are short individual lighting controls in our open office area. We are willing to modify the current control set up in order to comply. The option we have come up with is to add task lighting to the 9 workstations in that area. What type of task lighting is acceptable for that type of setting? Also if we do add task lighting would we need to eliminate some of the overhead 2x4 lighting? We want to make sure that we don’t have excess wattage in that area.