What Lights to Use For Growing Weed Indoors
Growing marijuana indoors has its advantages and disadvantages just
as growing the cannabis plant outside does. Indica marijuana strains are
perfect for growing marijuana indoors because of their short and wide
plant growth compared to the thin and tall growth of sativa marijuana
strains.
When setting up a home grow location its absolutely essential that
you choose the right lights at the right growing stages for your
marijuana plant. Marijuana plants grow in two stages; the vegetative
stage and the flowering stage.
The Vegetative Stage (A)
When a marijuana seed is first planted it enters the vegetative stage
where it begins to grow out its stems to prepare for budding and the
flowering stage. The vegetative stage can last anywhere from 1 week to
about 40 days and requires a standard day light cycle of 18 hours on — 6
hours off for the most effective results. Some growers prefer a 24 hour
light cycle for the vegetative stage, which will stimulate quicker and
faster growth. Either one should work fine, however, a standard day
light cycle may work better for pure Indica weed strains.
The Flowering Stage (B)
After 40 days or a couple weeks (or whenever you want to end the
vegetative stage) the light cycle needs to switch to 12 hours on — 12
hours off in order to start the flowering stage, which starts as soon as
you switch the light cycle allowing the plant to produce buds. When
choosing when to enter the flowering stage, after about a month use good
judgment based on plant size and health. For maximum growth most
strains can enter the flowering stage after about 40 days as long as the
plant looks healthy and is tall enough.
Keep in my mind that different weed strains combined with various
growing techniques will produce different results at different times.
Some strains may take longer to mature and prepare for the flowering
stage compared to others. If you know the exact marijuana strain seed
you have its a good idea to look up the average height when grown
indoors. This will give you a perfect measurement of when your plant has
matured and is ready to enter the flowering stage.
Ok, so now to the point of the article. What lights should I use for the vegetative and flowering stages?
The best lights to use for the vegetative stage would be any kind of fluorescent
bulb. This is because the cannabis plant loves tons of blue light in
the spectrum which can come in the form of many different fluorescent
bulbs which are common for home growers in the vegetative stage because
of their low height output and efficient blue hues of light. I wouldn’t
recommend using high energy and heat consuming Metal Halide lights
(which give off nice blue hues of light) unless you have a license to
grow medical marijuana and live in a state where its legal.
When you use lights that consume a lot of electricity, you run the
risk of having your energy bill draw suspicion from authorities.
Luckily, there’s really no need to deal with anything other than blue
hue fluorescent bulbs for indoor growing until you get to the flowering
stage. This is where a High Pressure Sodium light would works best
(alone or with the fluorescent lights) and you can get away with it
because the lights will only be on only 12 hours a day which will
consume less energy and heat.
You can see in the diagram below that the cannabis plant requires blue and white light (Metal Halide & Fluorescent lights) for the vegetative stage (A), and red, orange, and yellow light (High Pressure Sodium Bulb) for the flowering stage (B).
Light Spectrum For Growing Marijuana
image: howtogrowmarijuana.com
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