A biostimulative illumination apparatus for treating patient tissues includes at least one light emitting diode which can generate at least one narrow-pulse focused wave band suitable to be used as low-power and non-parallel focused light beams for biostimulative illumination. The wave length of the focused light beam is from 600 nm to 850 nm, the energy density of the focused light beams is from 2 Joule/cm2 to 16 Joule/cm2 and the divergence angle of the light beams is lower than 16°. In addition, the invention also provides a biostimulative illumination treatment method.