Abstract: A luminescent solar concentrator (10) is disclosed. The luminescent solar concentrator (10) has a light guide (12) defined at least in part by a reflector (14). It has a plurality of light absorbing centers (24) located in the light guide. The light absorbing centers (24) are configured to absorb sunlight (25) instant on the light guide (12). There are a plurality of light emitting centers (26) located in the light guide (14). Each of the plurality of light emitting centers (26) are capable of emitting light (18) after at least some of the energy of the absorbed sunlight (25) is transferred (28) from a respective one of the light absorbing centers (24). Each of the plurality of light emitting centers (26) are orientated relative to the reflector (14) to enhance the proportion of light emitted by the respective light emitting center (26) that is reflected by the reflector (14) and so guided within the light guide (12).