light intensity of gt 1 000 mw cm u02c62 at the output end of the liquid light guide 15 when operating in pulsed mode the peak output intensity can reach a level of several thousand mw cm u02c62 the flexible liquid light guide 13 can be bended over a radius of several centimeters making it possible to illuminate those hard to reach areas on the treatment site the liquid light guide 15 is fixed at the proximal end by an adaptor 23 for led light coupling and delivers the light from the led array to the treatment site through an output port 24 the length of the liquid light guide 15 may range from several tens of centimeters to several meters depending on application requirements the whole light emitting module including the led array 10 the heat sink 11 the driver circuit 19 the feed back beam splitter 17 and photo detector 18 the lens set 14 and the coupling adapter 23 is enclosed in a housing 25 in comparison with fiber bundle based light guides the liquid light guide does not have the filling factor and hot spot problem it also exhibits larger acceptance angle larger core diameter better transmittance in the uv and nir wavelength regime and a more uniform light output in the foregoing specification specific embodiments of the present invention have been described however one of ordinary skill in the art appreciates that various modifications and changes can be made without departing from the scope of the present invention as set forth in the claims below.