Lighting for indoor growing & everything you need to know. Let’s cover all aspects of light types. There is Led, Hps, Mh, and Cmh, which are all good for indoor growth. We want to achieve the ultimate lighting for max output in harvest.
The main drawback to using metal halides to grow cannabis is the fact that they get very hot. MH lights are beneficial during the vegetative growth stage of the cannabis plant because they produce a soft blue light that the plants adore. You just have to keep them a good distance from your plants, so they don’t burn.
Although Mh are good lights, they need assistance for flowering and fruiting in the red spectrum. Therefore, you must incorporate an Hps light or led for the full spectrum needed for flowering.
High Pressure Sodium grow lights are cheap in cost. HPS grow lights produce fast growth, fat dense buds and consistently big yields. HPS lights have a solid reputation at producing great yields. Hps do run very hot, so you will have to cool the room down in some effect. You will also need fans to circulate the hot air, to stop mold and stagnation. Be aware that both Mh & Hps lights are expensive to run. Your electric bill will take a hit, but its worth it.
Led lights rival all other lights, they are cheap to run and cover all light spectrums. They are, however, very expensive in a comparison to other lights. Although, they are well worth the price paid for. LED lamps emit more light per watt than incandescent bulbs allow the grower to use multiple LED lamps.
You can mimic the noon sun in the summer, which has more blue (great for the vegetative state), and the waning light of autumn, which has more orange—this is great to help your plants begin to flower. LEDs in general are easier to use too. Metal halide and high-pressure sodium lamps require heavy ballasts, which convert the voltage from a wall outlet to a higher voltage that will ignite a bulb.
The spectrum of light produced by this latest development is far more natural. LEC bulbs will last up to two years, which is significantly longer than any other options (besides LED). They also give off a lot of heat. It is less than HPS or MH lights, but enough to warrant sufficient airflow and cooling options, again potentially adding to the startup cost if you do not already own ventilation equipment. LECs don’t quite match the same light intensity of HPS varieties, so you would need to position the fixture closer to the canopy of your crop.
The benefits of LEC outweigh most of the negatives. Since the light emitted from a CMH is akin to natural sunlight, its spectrum is closer to that of natural sunlight, so that plants exposed to CMH light are getting a wider range of wavelengths of usable light than other types of grow lights can produce.
So, in my humble opinion, this is the very best lighting situation for growing a successful harvest. I would put a 1 to 1 ratio of 1 Cmh light to 1 led light and stagger them. Putting them about 3 feet apart. This should cover every spectrum of light that man can copy, that is closest to the sun.