Theories of large extra dimensions allow for the creation of primordial black holes in the Early Universe, leading to a novel cold dark matter (sub)component. Because of their existence in a higher-dimensional space, the usual relationship between mass, radius and temperature is modified, leading to distinct behaviour with respect to their 4-dimensional counterparts. We derive the cosmological creation and evolution of such PBH candidates and obtain preliminary limits on LED PBHs from direct observation of evaporation products, effects on big bang nucleosynthesis, and the cosmic microwave background angular power spectrum.