LED Grow Light

How Far Should I Hang Light From Plants?

How Far Should LED Grow Light Be From Plants? This is a trouble that numerous farmers, particularly marijuana growers, have. Some farmers hang the light very high, 30-40 inches from the top of the plant, as well as the plants, are really weak. Because the led grow lights is as well far away from the plant, the light is substantially lost in the procedure of dispersing, and the light that in fact gets to the surface area of the plant is very little absorbed by the plant, causing the plant not having the ability to soak up adequate light to expand. In order to allow plants to soak up more light to grow, some cultivators hang the led expand lights very close to the plants, therefore, the plants on top are stressed out. Hanging the light expensive will throw away light, as well as hanging as well close will melt the plants, so just how do we make a decision on the height of the led grow light? Past that, right here are a couple of insights and tips that can help you make the best options for your plants.

hang led grow light from plants
Measuring height from the plants

The very first thing you need to take notice of is the leaf surface temperature. 

Most kinds of hemp will certainly not be burned if the leaf surface temperature does not go beyond 29 degrees Celsius. While maintaining the leaf surface temperature not going beyond 29 degrees Celsius, you can hang the lights as close as feasible to your plants. This will not only increase the utilization rate of led grow lights but likewise enable plants to soak up sufficient light to expand.

The second thing you require to pay attention to is PPFD


PPFD (Photosynthetic Photon Change Density) gauges the amount of light (PAR) a plant obtains gradually. As a matter of fact, changing the hanging height of the led grow light is to change the PPFD that the plant can get. Normally, the minimum PPFD worth required for plant growth is 400μmol/ m ²/ s, and the optimum PPFD value that can be soaked up by plant development is 1200μmol/ m ²/ s, and also the component going beyond 1200μmol/ m ²/ s will certainly not be soaked up by plants. As a result, we should ensure that the PPFD value that the plant can take in is over 400μmol/ m ²/ s, and there is no requirement for too high a PPFD value, the component going beyond 1200μmol/ m ²/ s will be lost. There are 2 major kinds of lights on the market now, one is board light and the other is bar light. Bar lights can typically be put up closer to plants than slab lights. Typically, led grow lights suppliers will provide PPFD maps for cultivators’ reference. Obviously, it would be better if you have a par meter that can determine PPFD values. We can readjust the hanging elevation of the light according to the PPFD map or the in fact measured PPFD, so regarding make certain that the surface area temperature of the leaves does not exceed 29 ℃ so that all plants can get greater PPFD as much as feasible.


The last point to pay attention to is what development stage your plants remain in


Typically, we will certainly divide the growth of hemp right into 3 phases, seedling stage/veg stage/ blooming stage. Different phases of hemp call for different PPFD. It requires 400μmol/ m ²/ s for the seedling stage, 400-800μmol/ m ²/ s for veg, and also 800-1200μmol/ m ²/ s for blooming. We can change the hanging elevation of the lamp according to various development stages.

As a whole, there is no exact response to the inquiry Just how Far Should LED Grow Light Be From Plants? We need to change the ideal elevation according to the real circumstance, describing the fallen leave surface temperature, PPFD, as well as development phase. Typically, farmers utilize more and the variety of planting effects is 10inches-20inches. With the development of modern technology, several led grow lights have actually included a dimming feature. The grower can readjust the illumination of the led grow lights, dim the illumination of the led grow lights in the seedling phase as well as veg phase, and also hang the grow lights closer to the plants. This can achieve the purpose of obtaining sufficient growth light sources for plants and saving electricity. In summary, as long as you take notice of the temperature level, PPFD, growth phase as well as flexibly adjust the hanging height during the growing process, you can grow great plants as well as acquire high returns.

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2 thoughts on “How Far Should I Hang Light From Plants?

  1. Dave says:

    Can I add 50 watts of uv to my spectrum without damage to my babies?, I have 3×3 tent w 2 p punch, all bushed out ready to flower.

    1. hi friend, thank you for your comment, yes, you can add UV to your spectrum, but we recommend you not turn on the uv all the time, you can on the uv at 10-20 minutes before you turn off the light. 🙂

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