The light we work with in the sites we visit varies, but it often has a drowned, underwater quality. Filtered through dirty windows and foliage, it is diffuse enough to light a scene well and strong enough to make the highlights glow. Some places in the Grief Bros. plant had just that light, great for photography. A picture taken can have the seeming of a Ribera painting; work it in HDR, and you get closer to El Greco. The blueprint room in the offices had just this light.
The machine shop had a workbench strewn with stencils and paperwork in deep shadows.