LED grow lights are relatively new to the cannabis growing scene, but they have become wildly popular over the last few years with their ability to produce great yields while staying cool and using a reasonable amount of electricity.
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Average Yields: 3.5-5+ ounces – keep in mind that the strain (genetics) and any plant training you do will make a huge difference in your final yields. This LED model has performed better than most others I’ve tried so far.
3.) COB Style
Average Yields: 4.5-6+ ounces – keep in mind that the strain (genetics) and any plant training you do makes a huge difference in your final yields.
Normally with HPS fixtures, you place it high to pull out the hot air (as heat rises), whereas with LEDs, you probably won’t have the heat issue. If you place it on the floor of your tent, it’ll pull the warm air down towards your plants and keep them in the warmest air in the tent.
You can place your extraction system on the floor of your tent.
LEDs are known for keeping the heat down, making them incredible when growing over the Summer. During the Winter when it gets colder outside, you may notice temperatures dropping a little too much, so we’d suggest making sure your plants are hardy and your environment remains perfect.
There’s a few things you can do.
6) Keep an eye on humidity levels
The latest generation of LED grow lights have now surpassed HPS lighting in terms of what can be achieved per watt of electricity.
With most premium LED grow lights producing full spectrum light, they can be used to grow a plant under them from the seedling/cutting stage right the way through to the end of the grow. Young plants cannot take the same light intensity as a plant in peak flowering/fruiting. Also, LED grow lights still produce some ambient heat (but not infrared heat). Make sure you start with the light height quite high and lower it gradually (an inch or two each day) as the plant gets used to the light and grows larger & older. Raise the height of the light immediately if any sign of damage appears or if they look stressed. Stressed plants often have leaves hanging down as though they are a bit wilted and sad. An unstressed plant looks “perky” with its leaves pointing up.
With the air temperatures and leaf temperatures being slightly different when growing under LED grow lights rather than HPS, a lower nutrient strength is required. The general consensus among growers seems to be that nutrient strengths can be as much as 25-30% lower when growing under LED than HPS. Use a quality EC/CF/PPM meter such as the Bluelab Truncheon to help you give your plants the correct nutrient strength.
5) You may be able to use a lower Light Height
Secondly, use Vitalink Heat to promote growth hormones in your plants which help it during colder periods and stop any sudden temperature drops from shocking your plant.
As said above, LEDs produce less heat than traditional HID lights so you may find you want to turn down your extraction system. However, the extraction does not just remove heat, it also removes CO2 depleted moist air. With the extraction system running at a lower rate, you might find that the humidity level in your grow space increases. If it gets too high then your plants will not transpire at the ideal rate which means growth will slow down. Also, if the air contains a lot of moisture then you might experience mold/fungal issues too. Also, if the extraction system is running too low, the CO2 levels in the air will go down as the plants use it up during the process of photosynthesis. As it is with many aspects of indoor growing it is a bit of a balancing act, but not one that is too difficult to get on top of.