I agree with Alaric, those reflectors need to be improved. Chrome paint is generally a reliable choice, though it's not the only one. Ceiling-white paint (specifically) is also an excellent pick; it is very highly reflective of visible light and can help combat the tendency of some "chromy" reflectors to pick up too much sunlight. Some lamps also look better with white rather than chromelike reflectors -- less like they're dirty inside.
As I look at these photos, I find myself tempted to grab a ruler and compare the available space to the dimensions of standard bus-truck-trailer 2" x 6" oval lights and if you have the space, pick out the brightest available ones and graft them in.