The intensity of light, the quality of the spectrum and the amount of time the lights are on can affect different aspects of plant growth.

Intensity mainly affects the overall yield of your crop.

Spectrum mainly affects the quality of the plants’ structure, tastes and/or smells.

Photoperiod mainly affects when the plants begin their stages of growth, especially the flowering/reproductive process.

As you can see from the chart below, intensity, spectrum and photoperiod together have an effect on all aspects of growing. As an indoor grower you must consider all these lighting aspects to be successful.