luminaires are disclosed that include refractive and / or reflective structures that can provide or distribute lighting for a given area with high uniformity and efficiency . the structures can be used to distribute light from one or more light sources for lighting target areas with a desired light distribution . the lighting structures can be included in light strips or luminaires . such luminaire can be utilized in place of fluorescent lights and can facilitate quick and easy retrofit for previous fluorescent lighting applications . the disclosed techniques and systems can be particularly useful when employing one or more leds as light sources .