Now it produces 508 umol over a 4 ft diameter circle (60cm = 2 feet). Although LED, LEC and HPS grow lights can produce the biggest yields and most potent buds of all grow lights, they need to be used correctly to get those results! However, the LEDs that are being introduced now are so competitive that the prices have dropped down drastically. The most common mistakes with LEDs are not having enough light and not placing the light at the proper distance. If the light bothers your hand after 30 seconds, it may bother your plants! 315W is the most popular size for LECs/CMH grow lights. It is a type of Metal Halide bulb that is constructed with ceramic like an HPS. In addition to the wattage, it’s important to realize that older bulbs stop giving off as much light over time, so new MH/HPS bulbs generally need to be kept further away and older bulbs should be kept closer than the normal recommendations. Each type of light needs to be kept a different distance away, so if you feel confused, this tutorial will show you how far to keep your grow light so you get incredible results every time, no matter what your setup! Obviously, there are differences in how the lights perform, and it’s up to you to figure out what your plants truly need. If you want the very best yields, you must be prepared to work for it. The proper distance varies wildly between models. LEDs being introduced now come with separate vegetative and flowering switches. These were the first LED fixtures available and are still widely available today, and although they're not the best you can still get good results with them for cheap. If you see that all the leaves are turned up toward the light, it’s a sign your plants may be getting too much light. Here’s a quick example of how your autoflowers might fare under LED lights: As you can see, the color combination ends up looking white, that's what you should look when buying LEDs. When growing with this type of LED, you can add complemental horizontal lighting with the proper led strip spacing or vertical lighting with light bulbs to provide good light to the lower part of the plants. LEDs with fans help aid you when controlling the heat in your growing tent. Plants in the vegetative phase receiving 18 hours of light should receive between 306 and 617 uMol/second. Metal Halide lights are well-suited to the vegetative stage and tend to encourage plants to grow short and squat though they are less electrically efficient than HPS. On an 18/6 light schedule this would produce around 33 moles. To maximize the light to my plants in the flowering stage, I personally replace HPS bulbs every 3rd grow, but that’s a bit excessive. Even as a beginner, you’ve probably heard of LEDs. “LEC grow lights” are only sold by Sun System because the term “LEC” is trademarked by them. Fluorescent lights like T5s and CFLs typically can’t produce enough light to cause “light burn” the way you get with the other, more powerful lights. Auto-flowering cannabis plants start to flower after just two weeks. LED fixtures use up to 75% less energy while producing the same or even more light intensity. LEC stands for “Light Emitting Ceramic” while CMH stands for “Ceramic Metal Halide”. Some LEDs emit the whole spectrum of wavelengths so there's no need to change the light fixture for each stage. LED fixtures use up to, The manufacturing market is saturated with too many LED manufacturers and it is indeed possible to purchase cheap LED lights. If you’re using new bulbs, never start closer than the “~Sunlight” distance on the chart and only move lights closer if your plants are stretching towards the light (getting tall and lanky). Related story Best Light Spectrum to Grow Autoflowers. The LEDs introduced at the very beginning weren’t of any advantage to a grower since the light output was meager compared to other lights; however, with technology and years of research, many manufacturers now produce outstanding LEDs that almost mimic the sun’s full spectrum. Here’s a quick reference guide to use as a starting point: 250W – covers 2′ x 2′ (0.6m x 0.6m) area up to 2.5′ x 2.5′ (0.8m x 0.8m), 400W – covers 3′ x 3′ (0.9m x 0.9m) area up to 3.5′ x 3.5′ (1m x 1m), 600W – covers 3.5′ x 3.5′ (1m x 1m) area up to 4′ x 4′ (1.2m x 1.2m), 1000W – covers 4′ x 4′ (1.2m x 1.2m) area up to 5′ x 5′ (1.5m x 1.5m). I have studied the light distances for these lamps on the web and have not found the same distance recommended twice. Even though this has been fixed in newer fixtures, the light emitted by some LEDs is directional (like a flashlight), this means the area covered is less than when using bulbs, although manufacturers describe the coverage for vegetating and blooming plants so you will know everything you need to know before buying them. Older HID bulbs give off less light and more heat, so in addition to keeping the right distance, make sure you’re aware of the age of your bulbs. Usually the upper leaves are affected first (yellowing or turning brown or spots) by too-close LEDs, but symptoms can also affect other parts of the plant. Provide light – Use your vegetative grow light or setting on your grow lights as directed. You will need to train your plants in order to achieve an even canopy and get good harvests. LEDs with better features give you an advantage when growing cannabis. Obviously, no artificial light can mimic the sun but when talking about a full-spectrum light it means that it emits the entire, Due to LEDs being more efficient, they can produce an equivalent to light bulbs using less energy. But what exactly are LEDs? Manufacturers usually claim their LEDs are 1000W or 2000W but that’s actually the LED equivalent to bulbs, when looking to buy an LED, you should also look at the actual power that light fixture draws from the wall, this equivalent often differs depending on the quality of the diodes and efficiency of the light fixture. Where in the USA is Cannabis Legal to Grow? As an approximate guideline, LEDs use 12w to emit an equivalent to a 50w bulb. Plants in the flowering phase receiving 12 hours of light should receive between 460 and 925 uMol/second. See Symptoms of Light Stress (Which means Your Grow Lights Are Too Close). Some CMH models need to be kept 3 feet away from the tops of plants! Distance of Light – Image powered by Ledgrowlightsexpert.com Light distance is critical to the growth of your plants. Plants in the seedling phase require between 200-300 uMol/second. If in doubt, keep LEDs further away – It’s very common for cannabis growers to believe that as long as the temperature is under control they can keep LED grow lights as close as they want. As a result, LEC grow lights last longer and are 10-20% more electrically efficient than MH lights. Remember that not always the more expensive LEDs are better so make sure you research a lot before buying your light fixtures. With fluorescent grow lights, it becomes especially important to learn how to use plant training techniques. Conversely, they grow tall and lanky if the lights are far away. “CMH” grow lights have been around for many years, and used to come in typical HID sizes like 400W, 600W and 1000W. How Long Does It Take to Grow Weed Indoors? But, if you love big, thick buds then you have to go for the ones manufactured by brands that are a bit, Most companies provide a complete spectrum of light; however, it’s recommended that you do your, Even though this has been fixed in newer fixtures, the light emitted by some LEDs is directional (like a flashlight), this means the, As time passes by LED diodes can start to change color, even though they can last more than 50,000 hours, they can, A major advantage of using LEDs is that you don’t have to change the light to match the stages of the plant. Please let us know if there is anything else we can help you with. Although it may be tempting to keep trying to move grow lights closer and closer, your plants simply can’t use more light past a certain point! If you dig a little further, you’ll be surprised – nay, shocked – to find out that some brands offer 1000W lights for just $70 and others sell the same wattage LED for up to $1500! Increase Marijuana Yields Even More With Training! Wattage and Distance: How Far Should Your LED Grow Lights Be From Your Plants? My plants had been in 12/12 photo period for 1 week when I changed lights . Read an Indoor Grow Tutorial for the 315 LEC Grow Light. LED grow lights are powerful and can get great yields when used correctly. Growing seedlings with LEDs can be a little tricky. You get bigger yields and more potent buds by using powerful grow lights and keeping them, just the right distance away from your plants, test your current light levels with a lux meter. So the idea is to keep your plants as close as possible as long as the distance passes the “hand test.” You know your lights are a good distance away as long as you can put your hand where your plants are for 30 seconds and it doesn’t feel too hot for you. Unlike with MH/HPS/LEC grow lights, there is no “standard” distance to keep each LED grow light and it’s hard to summarize with a quick chart like the others. LEDs – Light Emitting Diodes – are lights that can be used to grow almost any type of plant. The LED Grow Light must be used properly for optimum growth and yield. It’s common to see a tiny tap root after a day of soaking but it’s alright if you don’t see them. In general, MH bulbs need to be replaced about once a year (every 2-3 grows), while HPS grow lights last a bit longer, up to 2 years (every 4-5 grows). When compared to bulb fixtures, LEDs are a tad more expensive. Autoflower seedlings need to be observed much more because the plants can get stunted if the tender leaves get burnt. The spectrum refers to a light source that covers the wavelengths that are useful to animal and plant life, from infrared to ultraviolet. The plants are super healthy, the buds are quite dense and the plant is strong, that's what you can expect when using good-quality LED fixtures. LEDs have come a long way since they were first introduced. Light – cool LED or CFL lamps are good as are high pressure sodium lights. ! This grower didn’t keep moving the 600W HPS light up as plants got taller, and some colas on the left plant got within 12″ (30 cm) of the bulb. Here are some examples of light stress appearing on the parts of the plant closest to the light. Cannabis Tissue Culture: Grow Plants in a Test Tube, How to Make Fantastic Bubble Hash from Bud or Trim. Smooth Leaves?! As long as it’s not too hot, you basically can’t give your cannabis too much light with these types of grow lights. Regardless of the name, LEC grow lights are basically a hybrid between Metal Halide and HPS grow lights. Copyright © 2009 - 2021. No, you don’t have to switch to a different light, but you may have to manually control the switches. For instance, the plant needs a lot of. Once you observe how the plants react, you’ll be able to judge the distance yourself. How To Make Your Own Homemade Rosin (dabs), Review of Nature's Living Soil for Growing Organic Cannabis. A major advantage of using LEDs is that you don’t have to change the light to match the stages of the plant. As you may know,  cannabis plants in nature grow under the sun so to get the best quality possible your light source should emit that resembles the sun’s light as close as possible, and that is the case with high-quality LED fixtures. In fact, you can grow any type of plant using LEDs without any issues. Even if you use CFLs, “Cool Blue Daylight” lights are used specifically in the growing phase. As said above, the equivalency varies depending on the quality of the light fixture, so for example, with medium efficiency LEDs that range from $150-$600 (usually) 1 LED watt is equivalent to 1.75 HPS watts. Fire Protection: Only You Can Prevent Grow Room Fires! LED fixtures will emit less heat than bulbs while emitting the same light intensity and drawing less power, you can easily find LED fixtures that come with fans but usually, it’s not needed as long as you are dealing with good quality diodes, and have fans and an extractor properly working in your growing tent. The most amount of photo pigments are of the 650 and 475 nano meter scale or the RED and BLUE light so a light source with light mainly in these wavelengths would grow the best autoflower cannabis plants! Both the 315 LEC and 315 CMH grow lights should be kept at least 18″ from the top of your plants, with some models needing to be kept as far as 3 feet away. Getting the right height distance is important because autoflowering strains may become stunted if they’re too close and too stretchy if the light is too far away. Most lights are placed at a distance of at least 18-22 in (46-56cm) away from seedlings, and you can do that too. In fact, many growers believe 24 hours of light is crucial when growing autoflowering plants, as it may give them the best chance to grow bigger in the vegetative stage and then eventually flower accordingly.Cannabis is classed as a C3 plant, meaning it can absorb CO₂ during periods of light for photosynthesis. How far away should you keep your grow lights for the best cannabis yields and potency? While standard fluorescent grow lights like T5s and CFLs really don’t produce enough light to overload your plants, powerful lights like HPS, LECs and LEDs can do so with ease. LEC grow lights are surprisingly powerful and must be used with caution to prevent light burn, especially with seedlings and strains that tend to be more sensitive to light. Contact the Manufacturer If Possible – Ultimately when it comes to LED grow lights, the best thing to do is contact the manufacturer (or read the specifications) to see what is recommended as far as distance from the tops of plants. LEDs were introduced just a few years ago, and growers wouldn’t even consider growing marijuana plants because they weren’t as good as other high-intensity lights in the market. Note: As an Amazon Associate, GrowWeedEasy.com earns a commission from qualifying purchases. A 600W HPS light should be kept about 16″ (40 cm) away from the tops of your plants. But, remember that this is true only with certain lights because some LEDs being introduced now come with separate vegetative and flowering switches. Be sure to I have a perpetual schedule where I keep harvesting 2 out of 4 plants so that I can always enjoy both veg and flowering aspect of In any stage be used to adjust the brightness of LEC/CMH or LED grow light or on! Epic cannabis Pictures bigger buds use plant training techniques after you ’ re really in. Also consume less energy, making up for the initial investment in the USA cannabis! 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