Note about mixing LEDs & HPS grow lights for flowering: Recently there have been tests by growers coming out which indicate that using a mix of HPS and LED grow lights during the flowering stage of growth tend to produce buds that have a terpene (taste & smell) profile that mimics bud grown directly under the sun. It’s possible that the future of indoor cannabis growing is going to feature a mix of HPS and LED grow lights in the flowering grow room. The power and color spectrum of HPS grow lights tend to get better yields than any other type of grow light for the amount of electricity used, with the possible exception of some of the modern LED grow lights. HID grow lights get better penetration into the plant canopy than almost any other type of cannabis grow light and therefore tend to produce long, thick colas when the growing conditions are right. Modern ballasts often allow a grower to interchange MH and HPS bulbs, but it’s important you look for this feature if you want to use a combination of both MH and HPS. MH lights are generally used in the vegetative stage of growth (when plants are young and growing just stems and leaves), while HPS lights are considered optimal for use during the flowering stage when cannabis plants are producing buds. HPS lights can be used for the entire grow and will still get great results. This is because MH/HPS lights have to be kept fairly far from the plants. As a general rule of thumb, HID grow lights like Metal Halide (MH) and High Pressure Sodium (HPS) are most suitable for relatively larger grows where there is at least 5 feet (1.5 meters) of height in the grow space, though it’s recommended to use a taller space for the best results.
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