A Multi Wavelength collimated LED can be constructed using multiple units of single-wavelength collimated LEDs and beam combiners. This LEGO-like design will allow one to add/remove LEDs (or wavelengths) depending on his specific application. In addition, the multi-wavelength LEDs can be mounted onto a microscope using an adapter, or the combined LED light can be coupled into a lightguide using a lightguide adapter.