​Most fluorescence microscopes are specialist microscopes that emit light at particular bands of wavelengths (excitation) onto the specimen and the view the emission wavelengths coming from the specimens.  The wavelengths are usually controlled by special dichroic filters and the light source is specially selected to emit light at the wavelengths required.  Most fluorescence microscopes are equipped with a specialist digital imaging camera and software.  The majority of applications for fluorescence microscopy are in biological research fields but there are some industrial applications such as non-destructive testing where dyes in cracks (for instance) can be observed.