Some people believe that 24 hours is harmful, but that is up for debate. Most information you see on duration time notes that 16 hours is best for seedling growth. How Long Should Grow Lights be Above the Plants? Follow the trouble-shooting tips below and adjust the height if needed. You will need to test the height around your particular set up and light. For me this has been a significant space-saver (but I grow thousands of plants). It will extend to the edges of the trays, whereas the fluorescent bulbs only give off the productive energy to the plants directly under the bulbs. LED light energy will cover a wider range of area also. When I was using the fluorescent lights I needed to keep them very close to the plants, at about 1-2 inches. With the 5000 lumen LED lights, a good range would be around 4 inches. They give off a violet light, and if you are starting seeds in your home you will get a disco feel from these dual lights! How Far Away Should Grow Lights be From Seedling Plants?Īs mentioned above, the amount of lumens is directly proportional to how far away the lights should be from the plants. You can also purchase ”dual lights“, which have one red bulb and one blue bulb. The light they give off is very bright and looks white. They will have a bit of both blue and red, but they tend to have more of the cool light. The LED lights that I bought are considered ”daylight”. The red part of the spectrum relates to “flowering” growth and is important if you are growing plants indoors that you want to encouraging flowering. In fluorescent bulbs, these would be the bulbs that say “cool” The blue part of the spectrum impacts “vegetative” growth and is the most important color if you are just growing seedlings that will later be put outside for flowering. Color spectrum: The main “colors” that impact plant growth in grow lights are blue (cool), red (warm), and full spectrum.Watts: this only relates to the amount of electrical energy the lights use and is not relevant to plant growth.It is directly proportional to how far away the lights should be from the plants Lumens: the amount of lumens corresponds to the amount of growable energy plants can uptake.Here is an overall summary of the three components impact on seedlings: Watts only impact the cost of the electrical energy. There are really only two main components of LED grow lights that impact the growth of your seedlings, lumens and the color spectrum. I would read the reviews before ordering from Amazon.
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