Continuum Sources Emit radiation over a broad spectral range. Continuum in Wavelength, not necessarily in time. Most of these are black body emitters. The spectral range depends upon the temperature of the black body.
Spectral Radiance of a Black Body
Hydrogen or Deuterium Lamp Current through low pressure H 2 or D 2 Fused silica window nm
Xenon Lamps Pass current through high pressure Xenon Gas nm output, sapphire window Provide high intensity, but with high noise
Line Sources Emit intense radiation over a narrow spectral range (or line). The Full Width at Half Maximum (FWHM) for these sources is: FWHM 0.01 nm