The invention provides a light engine (54, 54') for a medical device, comprising -a plurality of light sources (41), -a plurality of optical fiber bundles (51, 52)； wherein each of the plurality of light source is butt-coupled or otherwise coupled to at an optical fiber bundle (51, 52), so that the optical fiber bundle receives light from the light source to which it is coupled. The light sources (41) can comprise light emitting diodes, LEDs, and lasers, in particular laser diodes. The light engine may comprise at least two groups of light sources, each group emitting a specific spectrum. The first group emits light with a visible light spectrum and the second group emits light with the excitation spectrum of a fluorescence agent.
