Because of the ability to pick specific nanometer wavelengths, LED spectrums can be finely tuned to a desired output. This gives the ability to create a spectrum for specific stages of plant growth. Unfortunately, that means an LED spectrum can also be manipulated in a negative way. For example, an LED system could produce only blue and red wavelengths like LED Spectrum 2 (see graphic at below). We know this will supply a high PPF number as all the energy is within PAR, however, it will not supply a good growing solution with its lack of balanced spectral energy. LED systems with a true full spectrum, similar to that of the sun or LED Spectrum 1, will produce a better growth result.