Thanks for the tip but can you explain why? All the research I've done so far on the subject seems to indicate that as long as the heat from the light source is not hurting the plant you can pump as much rays as you want at them.
Any docs on the subject would be appreciated as well thanks
you don't want to try giving seedlings the same amount of light you give a plant with 3 or 4 nodes, it'll burn them..
https://bioslighting.com/horticulture-lighting/led-grow-light-distance-chart/
Where Should Grow Lights Be Located?
For seedlings, LED grow lights should generally be mounted
between 24-36 inches above the plant canopy – however, this depends on the power (wattage) of the light source. Locate your LED grow lights at the furthest distance from the seedlings (~36”) – this keeps heat and light intensity levels lower and helps prevent seedlings from drying out. Once roots have been established and sprouting has started, the lights can be moved closer (usually within the first 2-3 weeks).
In the vegetative stage,
LED grow lights should be between 12-24 inches away from the top of the canopy. During this stage, more light is needed for photosynthesis, so the light source should be located closer to the plants.
As the plants progress through the flowering stage, their demand for intense light decreases. The top leaves of the canopy should be between 18-24 inches from the light source to produce flowers. It is at this stage that the plants increase in height and grow fruit. Depending on lights and how you want your crop to grow, it is not necessary to change the height of the lights during flowering, especially if you do not want taller plants.
How Far Should LED Grow Lights be from Seedlings?
At the very early stages of growth, seedlings are delicate and require less light intensity. This means you do not want to turn up the intensity too early as the seedlings will thrive with a far gentler approach. Depending on the size of the light, it is safe to keep grow lights located somewhere
between 24-36 inches from the top of the soil.
How Far LED Grow Lights Should be From Clones
Cannabis cloning is a process where clippings or cuttings from a mature plant are used to grow another plant of the same kind. The LED grow light distance above the clones differs from the height required for seedlings. With clones, they will need intense light to begin. Depending on the power of the light and maturity of the plants, this could vary quite a bit
between 14-36 inches from the top of the plant canopy.
