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As cannabis plants reach peak photosynthesis during the later stages of life it requires light on the red end of the spectrum.
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The most important general rule to remember about light and cannabis cultivation is that red spectrum colors induce flowering while blue spectrum colors promote growth.
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That means more red light is available to the plants exactly when they start fruiting.
The best grow lights for cannabis seedlings and the vegetative growth phase are the hlg 300l b spec the california lightworks solarsystem 275 veg master and the optic 300 veg.
Many cannabis growers still rely on t12 fluorescents for this stage of growth.
T5 fluorescent lights aren t the only fluorescent technology that works for clones and seedlings.
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Each bulb in a t5 fluorescent lighting system emits light uniformly which means all the plants placed under the light fixture will receive even amounts of light.
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However fluorescent lights will emit much more heat as opposed to leds.
Another great option for those looking for an led grow light for their seedlings the growstar full spectrum led grow light offers 225 pieces of led lights which includes red 620nm red 660nm blue 460nm white 6500k as well as uv 400nm and ir 740nm lights.
When to put seedlings under mh or hps you can turn the grow light on once the seeds have sprouted and they are in the soil or growing medium.
The best and perfect light cycles for seedlings is the most commonly used is the 18 6 light schedule.
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During the fall as cannabis typically enters into flowering stage the sun starts to move farther away from the earth.
When it comes to marijuana seedlings you won t go wrong if you opt for using fluorescent lights as well.
These are all led grow lights that are heavy on blue spectrum specifically designed for the vegetative phase.
Both spiral compact fluorescents and tube fluorescents will do a good job for taking proper care of your baby cannabis plants.
This means 18 hours of light per day and 6 hour darkness period but some uses the 20 4 or even 24 0 light schedule.