High Intensity Discharge (HID) grow lights provide a cost-efficient light source for the growing and cultivation of hydroponic marijuana. HID grow lights are considerably cheaper than LED lights, and whilst less effective overall, still represent a tried and tested option for many growers. Two types of HID grow lights can be used for indoor marijuana growing – High Pressure Sodium (HPS) and Metal Halide (MH).
Either type can be used for a full grow from seed to harvest but it is not recommended, or the lights can be alternated at different stages of plant maturation, taking advantage of the strengths of each type of light to maximize the plants’ growth and yield. Starting with MH during vegetative and then moving to HPS during the flowering stage.