Potential Effects of UV Light Sources on Fluorescence Color and Intensity. Analysis clearly shows that LWUV sources emit not only varying intensities and bandwidths of light at 365 nm, but also “extra” peaks resulting from mercury lamps and leaking filters. Our 3D fluorescence spectra demonstrate that small changes in excitation wavelength, even from a “pure” LWUV emission, can significantly affect the intensity and possibly the color of the fluorescence. For example, the intensity of N3 luminescence (measured at 439 nm) when excited by 400 nm excitation is approximately double that of the same emission measured at 360 nm excitation (figure 6). The mixture of the emission peaks from the UV lamp will affect the apparent color and intensity of the fluorescence, limiting the effectiveness and consistency of visual observation.