Others could easily draw up to 100 watts or more (ten times as much). Some grow lights are fairly low powered, using as little as 10 watts in use. This close proximity is possible because they produce substantially less heat than their HPS counterparts. LED grow lights are designed to be mounted between 6-12 inches from the canopy for maximum yields. How high should I hang my LED grow light? As your plant enters into the flowering and fruiting stages of its life cycle it will need more of the red spectrum of light at the lower end of the kelvin scale. What setting should I put my grow light on?įor vegetative growth, you should use lights that are in the 5,000-7,500 Kelvin range. It’s believed that they truly do “rest” during periods of darkness, and probably use this time to move nutrients into their extremities while taking a break from growing. Plants need a light-dark cycle to develop properly. In general, you should not leave grow lights on 24/7. That’s why LED grow lights are so popular – when they have to be left on all day, it’s best to use an energy efficient type!Ĭan you leave LED grow lights on all the time? This can vary up to 16 hours, depending on the conditions. To be effective, grow lights really need to be on for at least 8-10 hours a day. How long should LED grow lights be on plants? A good rule-of-thumb for LED grow lights is 32 watts of actual wattage per square foot of growing space for flowering medical or other large flowering plants. How many watts does a grow light need to be?Īs a rule of thumb, aim for 20 to 40 watts per square foot. Red light in the 610 – 720 spectrum range promotes flowering and budding. Violet-blue light in the 400 – 520 nanometer range encourages chlorophyll absorption, photosynthesis, and growth. What Color Light is Best for Plant Growth? More wattage may mean more light output, but it also means more heat output, which can lead to burned plants. Much like a human sunburn, your plants can burn or bleach if you use too much light. Blue light regulates plant growth, which makes it ideal for growing foliage plants and short, stocky seedlings (but too much will result in stunted plants). Red light stimulates vegetative growth and flowering (but if a plant gets too much, it will become tall and spindly). So, you can place them close to your plants without worrying about burning them. One of the biggest advantages of using LEDs is that they put off so little heat. LED grows lights should be placed from 14 to 30 inches above the plants. Balanced spectrum, incorporating a technically advanced 3K CMH full phase spectrum for superior growing power with best possible LED diodes.
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