LED lights, or "Light Emitting Diodes," as they are better known, emit a continuous spectrum.  The spectrum they cover is not as broad as other colored lights or incandescent lights.  A continuous spectrum is a spectrum which is uninterrupted as one wave length of visible light ascends the wavelength scale to the next visible light color.  An emission spectrum gives off certain white lines of demarcation at certain wavelengths.  These positions are clearly marked on the spectrum.  An absorption spectrum is the opposite of an emission spectrum.  Again, certain lines of demarcation are exhibited on the spectrum, interrupting the flow from one wavelength to the next.  The difference is there are dark lines at specific markings on the spectrum.  Light sources, such as LED's, have continuous spectra.  LED lights continue to mark advances in lighting and advance technologically over energy inefficient traditional incandescent lighting.