a light emitting unit comprises at least one lighting means for emitting light for heating a composite material , e . g . resin of a carbon fiber reinforced plastic , wherein the composite material can be fused and / or softened and / or cured , and / or be hold in a liquid state by the heating and wherein the emission of light of the lighting means can be controlled differently in several areas . furthermore , this relates to a method for producing a component made of the composite material as well as a method for producing the light emitting unit .