Plant growth and development is significantly influenced be both the quantity and quality of the light it receives in turning that light, through a process known as PHOTOSYNTHESIS, into the energy which the plant requires to successfully mature.
Proper indoor grow light can also mitigate disease pressures that are often seen with plants grown outdoors. These plants are naturally affected by the number of cloudy days versus sunny days, humidity and leaf wetness where lack of solar radiation may subject the plants to disease cultivation that the indoor grower can influence with lighting and irrigation schedules.