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General Tips and Tricks for Growing Cannabis / Common Mistakes to Avoid with LED Grow Lights
Common Mistakes to Avoid with LED Grow Lights

Common Mistakes to Avoid with LED Grow Lights

Mar 05, 2023 Posted by: Artorias Siff Growing Tips,  hang grow light,  led grow light

LED grow lights have become increasingly popular among indoor gardeners due to their energy efficiency, long lifespan, and customizable spectrum. However, just like any other type of grow light, using LED grow lights requires some knowledge and expertise. In this article, we'll go over some of the most common mistakes to avoid with LED grow lights to ensure that you get the most out of your indoor garden.

Mistake #1: Choosing the Wrong Spectrum

One of the most significant advantages of LED grow lights is that you can customize their spectrum to suit the specific needs of your plants. However, this can also be a disadvantage if you don't know what you're doing. Different plants require different wavelengths of light to grow optimally, and choosing the wrong spectrum can hinder their growth.

For example, plants that grow primarily in shaded areas, such as lettuce or spinach, prefer a spectrum that is heavy on blue light. On the other hand, plants that grow in full sun, such as tomatoes or peppers, require a spectrum that is heavy on red light. Understanding the light requirements of your plants and adjusting your LED grow lights' spectrum accordingly can make a significant difference in your plants' growth and yield.

Mistake #2: Using Low-Quality LED Grow Lights

Not all LED grow lights are created equal, and using low-quality lights can lead to poor plant growth and reduced yields. When shopping for LED grow lights, it's essential to do your research and choose a reputable brand that uses high-quality components.

Some of the things to look for when choosing LED grow lights include the light's wattage, the number of diodes, and the quality of the diodes. Low-quality LED grow lights may have fewer diodes or use cheaper components, resulting in less energy efficiency and lower light output.

Mistake #3: Placing the LED Grow Lights Too Close or Too Far from the Plants

Another common mistake that indoor gardeners make with LED grow lights is placing them too close or too far from their plants. When LED grow lights are too close to the plants, they can cause damage to the leaves and even burn them. On the other hand, if the lights are too far from the plants, they may not receive enough light to grow optimally.


As a general rule, LED grow lights should be placed at a distance of 12-24 inches from the tops of the plants. However, this distance can vary depending on the wattage of the lights and the type of plants you're growing. It's best to consult the manufacturer's instructions or do some research on the specific needs of your plants to determine the optimal distance for your LED grow lights.

Mistake #4: Overheating the LED Grow Lights

LED grow lights generate a significant amount of heat, and overheating can lead to reduced lifespan and lower light output. To prevent overheating, it's essential to choose LED grow lights with good ventilation and heat dissipation.
In addition, it's crucial to ensure that the grow lights are not placed too close to other heat sources, such as radiators or heaters. If your LED grow lights do overheat, you can invest in a cooling system or adjust the distance between the lights and the plants.

Mistake #5: Neglecting the Plants' Watering and Nutrient Needs

LED grow lights can provide your plants with the light they need to grow, but they cannot replace the need for proper watering and nutrient management. Neglecting your plants' watering and nutrient needs can lead to stunted growth and reduced yields, regardless of how good your LED grow lights are.

It's important to research the specific watering and nutrient requirements of the plants you're growing and monitor them closely. Overwatering can lead to root rot, while underwatering can cause wilting and nutrient deficiencies. It's also essential to ensure that the pH of the soil or growing medium is within the appropriate range for your plants to absorb nutrients efficiently.

Mistake #6: Using LED Grow Lights for Too Long or Too Short of a Time

The amount of time that you should leave your LED grow lights on depends on the specific needs of your plants and the stage of growth they're in. Some plants, such as lettuce or herbs, require around 16-18 hours of light per day, while others, such as tomatoes or peppers, may require 12-14 hours of light per day.

It's crucial to monitor your plants' growth and adjust the duration of light exposure accordingly. Leaving the LED grow lights on for too long can lead to increased heat and energy costs, while not providing enough light can result in reduced growth and yield.

Mistake #7: Not Rotating the Plants

Another common mistake that indoor gardeners make with LED grow lights is not rotating their plants regularly. When plants are exposed to light from only one direction, they tend to grow towards the light source, resulting in uneven growth and reduced yield.
To prevent this, it's important to rotate your plants regularly to ensure that they receive light from all angles. This can also help prevent pest infestations and fungal diseases, which tend to thrive in stagnant air.

Mistake #8: Ignoring the Environmental Factors

Finally, it's crucial to remember that LED grow lights are only one piece of the puzzle when it comes to indoor gardening. Other environmental factors, such as temperature, humidity, and airflow, can also affect your plants' growth and yield.
It's important to maintain a consistent temperature and humidity level in your grow space and provide adequate airflow to prevent stagnant air and pest infestations. Investing in a good ventilation system can also help regulate the temperature and humidity levels and prevent overheating of your LED grow lights.

In conclusion, using LED grow lights can be a great way to grow plants indoors, but it requires some knowledge and expertise. Avoiding these common mistakes can help ensure that your plants grow optimally and yield a bountiful harvest. Remember to choose the right spectrum, use high-quality LED grow lights, adjust the distance and duration of light exposure, and pay attention to your plants' watering, nutrient, and environmental needs. With these tips in mind, you can enjoy a successful indoor garden using LED grow lights.