A lot of phone apps claim to be capable of measuring PPFD accurately, but most of them are terrible. True grow light wattage can be determined by figuring out how many watts your grow light pulls from the outlet. High-light plants (perennials and vegetables) need at least 12 mol/sq m-day to get good growth. Step 3: Install the Aluminum Bars Fitted With Strip Lights. What Daily Light Integral Does Cannabis Require? DLI stands for Daily Light Integral. Less shading is a good solution for vegetable crops with a lower optimal DLI. It's important for us to get things right for our precious vegetable seedlings, so I spent a lot of time researching grow lights and even invested money in the right equipment to get solid answers to our questions when the answers could not be found. Proper light supply for your plants provides the necessary photons required for growth. Some indoor growers could flat-out disregard recommendations and double the required DLI for increased vegetation. Aim for a minimum of 20 moles of light per light session. Cannabis seedlings require only 200-300 PPFD during the first three weeks of life. Of those, only UV-A is beneficial to plants. Running extremely intense lights for short amounts of time, or extremely weak lights nonstop, is harmful to plants. One of the most important aspects of hydroponic gardening is cleanliness. The leader in profits, production and education for produce, New Report: Specialty Crop Growers Spending $500,000 a Year on Automation, Emma Rogers | Dr. Maxime Eeraerts | Lisa DeVetter, Ensure Proper Lighting For Your Greenhouse Vegetables, Trending Now: The World's Top Ag Colleges Ranking for 2023, 12 Tips On Choosing The Best Greenhouse Site, Tips For Mixing Your Own Fertilizers for Greenhouse Production, Georgia Produce Growers Watching Climate Forecast for Rest of 2023 Into Winter 2024, Marvelous Melon Varieties You Should Know and Grow, Mitigate Bitter Pit in Your Apple Crops With Auxin and ABA, Robotic Harvesting System for Greenhouse Tomatoes Being Put To the Test. PPFD measures how much light is hitting the plant in one second. Hitting that minimum 20 moles per day can be tough with a cheap grow light. This information will help you continue to adjust your lighting until your plants are producing at their very best. It is a major element in greenhouse production and, for floriculture producers in particular, what has worked for them does not work for vegetables. It gives the plants a second chance to get that wasted light that hits the ground first, she explains. 300-400. The marijuana crops first stage is also its most important. The login page will open in a new tab. 20 0 obj <> endobj 58 0 obj <>/Filter/FlateDecode/ID[<60861109269B4312B0ED2435976DD66C>]/Index[20 71]/Info 19 0 R/Length 162/Prev 205726/Root 21 0 R/Size 91/Type/XRef/W[1 3 1]>>stream We can help determine the best supplemental lighting layout to meet your production budget and plant DLI requirements. Ways the Landscape Can Impact Blueberry Pollination, More Research Information Needed in Battling Plant Pathogens, Gotham Greens Greenhouse in New York uses supplemental high-pressure sodium lighting for its basil crop.Photo credit: Chieri Kubota, University of Arizona. Copyright 2021 420ExpertGuide.com; All Rights Reserved. Click here to see the FC-4800 Price and Reviews at LED Grow Lights Depot, Click here to see the Green Sunshine ES300 at LED Grow Lights Depot, G8LED 90 Watt RED Flowering Booster LED Grow Light. The app measures PPFD, calculates DLI, and also has Lux and Kelvin temperature sensors. Similar effects are common in indoor growing, particularly when youre growing marijuana and other high-light intensity plants. I own one and you can read my full review for it here. DLI is measured in units of mol / m and each plant has a specific requirement of DLI for its growth. Due to plant anatomy diffuse lighting is also recommended to enhance photosynthetic activity in strawberries and avoid leaf shading within the plant. The cost of this light is quite low, yet the PPFD values up to 1.5 square feet are impressive enough to considerably boost light intensity in your existing grow space. Thats because autoflowers require 18 hours of light per day for the whole life cycle, instead of switching to 12 hours of light for flowering like photoperiod cannabis plants. 20,000,000 micromoles / 12(hours) / 60(min per hour) / 60(sec per minute) = 463 umol of light needed for 12 hours straight to reach 20 moles of daily light during a flowering lighting period. Metal Halide (MH) and High Pressure Sodium (HPS) grow lights are simple because the watts number you see in the name is typically whats being pulled from the outlet. Lastly, she says plant density should be somewhere between three to four plants or stems per square meter. How Much PPFD Is Needed For Flowering Cannabis? This step adjusts for that reality and calculates the amount of sunlight expected to reach the crop at a given time of year. So, putting in some more dollars for increased quality shouldnt hurt. The electromagnetic radiation emitted from light sources is what several plants need to grow. This law says if you know the intensity of your grow light at one height, for example 1000 micromoles at 18 inches, then every time that height is doubled, the light intensity is reduced by 75%. As long as you know the manufacturer provided (or self measured) intensity at one height, you can know with certainty the intensity at another height. Thats right, Im recommending the TS-600 Mars Hydro for use as a bloom boosting LED light to bring your PPFD values up to sufficient levels. A DLI of 10 or 12 mol m2 d1 with 2 L of NS per plant and a DLI of 12 mol m2 d1 with 3 L of NS per plant made it possible to achieve both the best total biomass production and the . Based on estimations, the categorisation of the target DLI requirements for the leafy vegetables are as follows: kailan, pak choy, and bayam grow well under very high amounts of light being 47.22, 39.96, and 33.95 mol m 2 d 1, respectively; cai xin grow well under high amounts of light at 24.51 mol m 2 d 1; and kang kong, Chinese cabbage, and The second method would be to simply adjust the hang height of your grow light. To deliver the minimum required 20 moles of light per day, your grow light will need to emit 308 PPFD for 18 hours straight during the cannabis vegetative (veg) growth phase. During propagation, light should be managed based on the instantaneous intensity (PPFD), but we can also consider DLI, as research has shown that rooting of some crops can be delayed when the DLI is below 4 or 5 mol/day. %PDF-1.6 % It is measured in micromoles/sq. It measures 390nm to 690nm wavelengths the PAR wavelengths. All Trademarks and Trade Names are the property of their respective owner. 400-600. I discovered the benefits of Cannabis at a young age in 2002, with years of trial and error, my knowledge grew just like my plants. Now that the grow light is in a safe position, measure the PPFD output at the plants leaf level. Fill out the form below and we'll send you everything from growing seeds, grow light reviews, grow tents and kits, and so much more! {7LF22edEJ11-a.`:T9D(rL(4sGa9*`:Tau9LtL2+r~>GyJY/?n>1(1A(WtQ]lDMu. A good resource that provides DLI information on many crops is the Purdue Extension publication on daily light intervals www.extension.purdue.edu/extmedia/ho/ho-238-w.pdf. Adhesive pads at the end of the bars will secure the lights above the sides of the indoor garden frame. As the light intensity and/or duration increases, more nutrients/water will be consumed by the plant. If the plant looks like its burning, curling, or otherwise running away from the light, decrease the intensity and DLI. Getting the perfect lighting for your plants comes down to five steps. All marijuana plants produce THC and CBD in different amounts, regardless of their strain. Like the doors above, plant varieties have standard DLI requirements. Ultraviolet and infrared wavelengths are just below and above each end of the 400-700nm PAR spectrum, and are often included in grow lights because they have specific benefits to plants. The glazing affects whether the light coming in is diffused or direct, and by effect, how much light the plants are receiving. Light Requirements: Full Sun. Ulraviolet light is divided into three distinct wavelength ranges (UV-A, UV-B, and UV-C). Alexander is a former associate editor with American Vegetable Grower. Quality full-spectrum LED lights provide lighting in the full PAR wavelength spectrum. In the 700 nanometer range, light is red colored. Some strictly specify the PAR spectrum at 400-700 nm, while others give a more extensive range at 350-750 nm. You can also try the Apogee conversion calculator as well. So when youre purchasing a grow light, make sure its strong enough. Because there are so many lighting options, Kubota suggests first contacting a lighting company to help you come up with a design suggestion. DLI is the measure of photosynthetically active radiation (PAR) that is received by a specific area of plant canopy in a 24-hour period, Figure 1 visualizes the difference between DLI and PPFD. Thats 306 to 617 PPFD for the entire life of the autoflowering cannabis plant. d1. If the sun doesnt get to where your crops are, its best you increase lighting around your plants. 223 0 obj <> endobj For example, if the outside DLI is 10 moles per square meter a day, the inside should be between five and seven for most greenhouses, she says. hbbd```b`` DrJ`RLjIYDrlk$" "&>`2D_" V; S,"+@v? d20[G``310C wFiu g& My goal is for 420ExpertGuide to be a one stop shop for indoor growers to find the information they need. (DLI) Daily Light IntegralDLI is a measure of the total amount of photons that a specific surface area receives during a 24 hour period. Total daily light requirements vary considerably between different plant species. Which color light to grow marijuana plants? Youll notice on most grow light intensity charts, the PPFD numbers decrease with increased distance from the light. Marijuana variants with seedlings take much longer to grow than seedless variants. At the veg phase, your cannabis plant has to receive upwards of 20 moles of light each day. As a way to support my blogging efforts, I participate in Affiliate Programs. The actual range is from 400 to 700 nanometers (nm). Chandra, Suman, Hemant Lata, Ikhlas Khan, and Mahmoud Elsohly. Increasing DLI positively influenced lettuce FW; an increase from 1.27 g/plant to 4.33 g/plant was measured. It is called 'photosynthetically active' since the light is the energy source required to drive photosynthesis (and therefore growth) within the plant. Because this is a make-or-break stage, cannabis growers are mostly at odds on numerous fronts. For this light, the recommended grow area is 2-foot by 2-foot. DLI for greens tends to be around 12-14. Therefore, for most floriculture crops, plant quality increases with DLI; plants develop more branches, thicker stems, more and larger flowers, and more roots when grown under a high DLI than a lower one. And if youre a marijuana grower, the debate on how much daily light integral (DLI) your plants need is indispensable. #1. The first is the total number of watts in the LED chips themselves. This is the amount of light fruit, vegetable, and cannabis plants need each day to produce fruit vegetables or marijuana. When you know your plants' optimal DLI requirement, you can tune your lighting to ensure it doesn't get too much or too little. According to Kubota, because the weather stations measure light data in energy-based units such as watts per square meter, which is not useful for greenhouse lighting purposes, you will have to translate the data into moles, allowing you to calculate your DLI. %%EOF Can I Increase or Decrease the PPFD of My Grow Light? That way the amount of light available per plant is increased. For young seedlings, adjust the height of the grow light so that it provides a DLI of 6 to 10 with a 12-hour light cycle. Photosynthetically active radiation (PAR) is the range of light wavelengths that enables photosynthesis in plants. Fortunately, with this pak choy growing guide, it's never been easier to grow your own at home. Water Requirements: Moderate to high. The number of hours the lights will be on. Now that you know how to measure light intensity, you can answer most of these questions for yourself. Several PAR meters are available for getting accurate readings across your grow tent (see grow tent kits). 1365 Masselin Avenue, Los Angeles, California. 2=Requires cool or moderate temperatures to perform well at high-light levels.3=Stock plants perform well under higher light levels than finished plants. Subjecting plants to excess PPFD is likely to cause their leaves to go brown. Next, its time to research grow lights. The lower your light hangs, the light will be more intense, but it will cover a smaller area. Going closer than the recommended minimum distance may damage your plants. If your DLI is very low, you might try a much lower density. Keep reading and youll get to it! Spoiler Alert: They're Affordable!!! Most vegetable crops have a specific minimum DLI level recommended. If your phone doesnt have a light sensor (download the Lux meter app and try), or if your phone isnt measuring properly, you can purchase a Lux meter for next to nothing. Fruit or vegetable bearing crops need between 20 and 40 moles of light per day. Owners of this light absolutely love it, and to paraphrase some of their reviews from Green Sunshines site, a grower with 10 years of growing experience said the ES300 resulted in the fastest growth theyve ever seen. But the DLI isnt expected to exceed 35 units during this period. If a grower wants to increase the DLI by 10 molm -2d-1 and plans to operate lamps for 18 hours per day, then an intensity of 155 molm-2s-1 (1,175 foot-candles) needs to be provided. Greenhouse DLI values rarely top 25mols/m2/day. This calculator will help you determine your target PPFD range. Plant factories using artificial light to produce vegetables have high energy costs due to the high demand for electricity for lighting. If the glazing material converts sunlight to more diffused light, it might help distribute the light lower in the canopy. Roleadro Grow Light Review | Top Picks From This Brand & Buying Guide, Everything You Need to Know About Grow Tents, The Best 1010 Grow Tents for Indoor Growers. Measure Your Light Bartok is a regular contributor to Greenhouse Management and an agricultural engineer and emeritus extension professor at the University of Connecticut. Chris Cook started Happy Hydro Farm to share his passion for hydroponic gardening! This info is useful, but only covers a brief moment in time. The map will also show what size growing area the light is suitable for. Rinse & RepeatThis process may take several cycles to dial in, but youll end up with very specific data related to the plants in your environment. You can swipe lefts and right to swap between modes (PPFD, DLI, LUX, etc). Petunias, according to him, do well with a DLI of 6, whilst begonias do well with a DLI of under 11. If thats your case, dont worry, you can easily add PPFD intensity without throwing out your current grow light. Use the PPFD maps along with this DLI calculator to make sure the grow light will deliver enough light to meet the daily requirements of the plants you intend to grow. Just as you can use a rain gauge to measure rainfall, you can use a light meter to measure DLI, typically expressed as moles of light (mol) per square meter (m 2) per day. Many of these hybrids can withstand lighting some other variants cant handle. Grow intensity charts usually show how much PPFD you should expect your plants to get. Values between6-18 mol / m / day are the most commoni, but may vary depending on the particular plant. By entering your email address you agree to receive emails from Happy Hydro Farm. Optimizing your crops daily light integral will improve plant growth. These can be recorded to get weekly or monthly totals. An optimal cannabis yield is what cannabis plants grower desire, particularly newbies to indoor marijuana soil planting. Dont opt for the most inexpensive model, or youll regret it. This is a more accurate number because the light intensity (PPFD) is more closely correlated to wattage at the wall. As an approximate conversion, 1 watt per square meter of solar radiation contains about 2 micro-mole per square meter per second of photosynthetically active radiation. Unfortunately the Apogee meter seen above is a bit expensive. 40 mole/day (the maximum PPFD): 617 umol across whole coverage area for 18hr during the vegetative phase. In other words, DLI measures how much light a plant has received during a day. High-light plants (perennials and vegetables) need at least 12 mol/sq m-day to get good growth. Keep in mind that light and nutrient requirements are directly related. One of the first things is to make sure theres nothing obstructing the light coming in, for example, hanging baskets, or anything attached to the beams. By: Chris | Last Updated: September 20, 2021. Step 3: AdjustAdjust the height of your light and/or how long the lights stay on to dial in a DLI that matches your plants needs. Sativa, haze, and equator strains are ideal fits for increasing your marijuana DLI. If youre growing autoflowers you should stick to the same PPFD thats recommended for the vegetative phase. Before we get started, there are three terms you should be familiar with. Accurate DLI measurement will be incomplete without mentioning two terms micromole (mol) and photosynthetic photon flux density (PPFD). For a full list of the best LED grow lights of the year, check out my Best LED Grow Lights post. During the vegetative phase most people set their grow lights to 18 hours on, and 6 hours off. DLI is the amount of photosynthetically active radiation (the range of solar radiation that is able to be used by organisms in the process of photosynthesis) received each day, expressed in moles per square meter, per day. Inches, centimeters, meters, and so on are measurements. Theres a law of physics called the Inverse Square Law. Thats true for cannabis as well. They show abnormal physiology under those conditions, so growers need at least a few hours of total darkness for the crop and should estimate the target intensity based on that.. Instead, you'll need the help of a specialized PAR light meter that provides an accurate PPFD reading and DLI calculation. Pay attention to light, and read the data. Unfortunately, we can't see the PPFD that's striking a plant's leaf and can't calculate DLI in our head. Just like you can get sunburned, plants can also get 'light burned'. Become a free Member and well keep you in the loop on our best advice and tests for horticulture, grow lighting, light measurement, This is the term for the intensity of light at your plant leaves surface. Medium-light plants (most annuals) require 6 to 12 mols/sq m-day. Step 4: DocumentMake notes about the adjustments you make, and the target DLI youre aiming for. Even moreso when you switch to the flowering phase and have 6 less hours of light exposure. Ornamentals Versus Vegetables If you need an strong and efficient grow light that truly covers your entire space, Green Sunshines Electric Sky 300 (ES300) is the way to go. Follow these guidelines for obtaining a proper PPFD output and youll be growing like a pro. This explains why the light intensity can vary widely among grow lights all claiming to be xyz number of watts theyre each consuming varying levels of wattage at the wall. New Growers Start Here Complete Supplies List! In simpler terms, the daily light integral is a description of how much light your cannabis plant has access to each day. The tables below list our recommendations for PPFD levels based on our experiences at Florawave and Carnivero. Below I break down how much PPFD is needed for each phase of cannabis growth in order to achieve 20 or 40 micromoles of light per day. If youre on a budget you can also look into the slightly less expensive Mars Hydro TS-3000. Its essential to know that the photoperiod rating of marijuana means it needs a dynamic level lighting program. We tried to make it easy for you to dig through the marketing and figure out what PPFD values youll truly need to maximize your cannabis yield (or other plants yield). Fresh weight (FW), dry weight (DW), leaf area, and chlorophyll concentration were measured. The wavelengths of light detected by this meter are the exact wavelengths you want on your plant. Its not! Step 1: ResearchResearch the plant to find its optimal DLI. Think of this as the specific band of light used by cannabis plants (and other plants) to grow. Measure Your Light . He is an author, consultant and a certified technical service provider doing greenhouse energy audits for USDA grant programs in New England. Within the DLI chart, youll find a recommended DLI range and a recommended lighting duration. Does the Green Sunshine ES300 grow light provide enough PPFD intensity for your plants? Mars Hydro TSL-2000 Watt Quantum Board Grow Light: What if you own Grow Lights that dont have strong enough PPFD levels? Download the First Grow Cheat Sheet for step-by-step instructions, DIY templates, and shopping lists that will take your first grow to the next level! The opposite is also true, if the light intensity/duration is reduced the rate of nutrient uptake will also be reduced. Match the DLI output of the grow light with the DLI requirements of your garden. See all author stories here. There are many other reviews from people who switched from cheaper LED grow light models like Viparspectra or Meizhi. UV-A light triggers the same defensive proteins in your plants as if they were being eaten or attacked by insects, so it makes your plant more resistant to insects as a result. For crops like tomatoes and cucumbers, optimum DLI is much higher, around 30 or greater, while for other crops optimum is around 15 to 20, Kubota says. And with the extra illumination, these crops could surpass expectations. Photosynthetically active radiation (PAR) refers to the light wavelength range that supports plant photosynthesis. If youre moving into vegetable crops, this would be the time to install your light sensors. After logging in you can close it and return to this page. But most growers are keen to know how the daily light integral affects metabolite production. (PAR) Photosynthetically Active RadiationLight with a wavelength roughly between 400 to 700 nanometers. Wipe off any dust or dirt that accumulates. His mantra - "Take excellent care of your plants, and your plants will take excellent care of you.". They also happen to be my budget choice because theyre so damn affordable. As an Amazon Associate I earn from qualifying purchases. Photone is an easy to use, accurate light meter. Thats at a rate of 200 300 PPFD for eighteen hours. So 20,000,000 micromoles / 18(hours) / 60(min per hour) / 60(sec per minute) = 308.6 umols needed to hit 20 moles during an 18 hour vegetative phase lighting period. Understanding daily light integral (DLI) will help you answer those questions. The production curve from a crop in relation to the amount of moles delivered per day sharply increases between 20-30 moles, begins to really level off between 30-40 moles and over 40 begins to hit a point of diminishing returns for your crop. Grow light wattage doesnt matter. Pak choy, also known as pok choi or bok choy, is a type of non-heading cabbage belonging to the Brassicaceae family, cultivated for its tender stalks and flavorful leaves.. It's among the more common Asian vegetables that you'll find in stores, but it's always best enjoyed fresh. If you want better yields, you can increase the PPFD up to 925. Its the unfortunate result of marketing tactics companies use to make somewhat similar grow lights look different. If you can comfortably keep your hand in place, the grow light is far enough away. How to determine the true coverage area of a grow light. Along the left and bottom sides of each map, the grow area size is listed. You can write John at jbartok@rcn.com. Light plays a major role in the successful growth and bountiful harvests, whether youre an indoor grower or outdoor grower. [DLI is well defined in the article in this link: http://goo.gl/MUo1VT]. These five steps are a looping process, meaning that you can perform them over and over to find that perfect lighting scenario for your plants, in your environment. The Best Cannabis Seed Breeders According To Reddit (2023 Update). The PPFD values outside of that 11 ft area shown on the chart below are barely even enough to hit a bare minimum 20 moles of light during either growth phase. Ensure you create a perfect environment for your marijuana plant to get the right DLI. 2=Requires cool or moderate temperatures to perform well at high-light levels.3=Stock plants perform well under higher light levels than finished plants. Once youre able to get a lux reading, take that number over to Waveform Lightings Lux to PPFD calculator, select the light source closest to the light youre using, enter the number of lux you measured, and press calculate! The new bar style design of the FC-4800 spreads light in a uniform manner across your entire 44 foot canopy, beating out older boxy and purlple spectrum grow light designs. Step 2: MeasureMeasure the light intensity at the plant surface (top of leaves). These new Mars Hydro TSL-2000 watt LED grow lights will spread sufficient PAR light intensity onto your 24 canopy. Advertisement The formula for calculating DLI is: mol m-2s-1 (or PPFD) x (3600 x photoperiod) / 1,000,000 = DLI (or moles/m2/day) If you are an ornamental grower considering adding or switching over to vegetable crops in your greenhouse, there are many considerations for a successful transition. Therefore tomatoes require roughly twice the amount of light intensity as lettuce if applied during the same period of time. Grow Tent Light Leakage How Much Is Too Much? Mars Hydro has always been a brand that offers a great bang for the buck, and thats why Im listing the FC-4800 as a great candidate for a 44 foot grow space. Changes in DLI over time. If you want to get super sciencey, you can even document the dry weight of the plant along with leaf count at harvest to compare with future DLI adjustments. The values on the chart will get you into the ballpark. But with many modern LED grow lights, there are two wattage numbers to understand. They say the difference is night and day. This level of light can easily be achieved with most grow lights. meter /second. Step 3. Come teach one of more than a dozen foreign languages taught at DLIFLC in beautiful Monterey, California and be a part of one of the largest language schools in the world. Step 4. The strong light intensity lasts all the way to the edge of the 24 foot grow space. The flowering phase is equally important to the end quality of your cannabis harvest. You can grow marijuana plants using purple or white grow lights, as long as the intensity (PPFD/uMols) is strong enough. The cost is less than $60. Its important to understand the meaning of PPFD if youre growing cannabis. Cant go wrong with a few of these to brighten up your corners! Apogee DLI-600 Full Spectrum PAR/PPFD Meter This is a highly rated PAR meter that'll tell you if your grow light PPFD is strong enough for your cannabis (or other) plants. Using the app is simple. It can also be damaging if your plants get too much exposure, so only a couple infrared diodes are included in LED grow lights. If your marijuana flowers as it should, you can expect a good harvest. Similarly, DLI is a measurement. If you need help finding the DLI range for a specific plant, jump down to the plant DLI chart. Grow lights generate heat. In other words, DLI measures how much light a plant has received during a day. You should also understand how the Daily Light Integral, the PAR light spectrum, and wattage play into growing cannabis plants. PPFD values usually drop as light naturally loses its strength from source to transmission end path. To calculate DLI, you need to know two things: the PPFD reaching your plants leaves, and how long you want to run the grow lights every day. If the DLI is too low, lower the light closer to the plants. You already know its lighting needs. endstream endobj 224 0 obj <>/Metadata 5 0 R/Pages 221 0 R/StructTreeRoot 12 0 R/Type/Catalog>> endobj 225 0 obj <. The PPFD parameters are usually much stronger when measured close to your grow light. Measuring Plant Light If you're like us you want to optimize the PPFD and DLI levels for your plants for the best results in both plant growth and electricity consumption. 12-hour, 18-hour, or 24-hour Lighting Which is Better for Marijuana? The surface area were interested in is the surface of our plants and their leaves. Make sure you hang the grow light at the correct distance from the seedlings. We've got you covered: Look up your plant's DLI and PPFD requirements in our plant light database and optimize your garden's lighting accordingly. 926 umol across whole coverage area for 12hr during flowering. Just to reiterate, youll want the following PPFD readings on your plants: 20 mole/day (the bare minimum PPFD): 308 umol across whole coverage area for 18hr during the vegetative phase. Several elements, like hours of light, light intensity, and grow light spread could impact plant growth at this stage. A more important measure is PPFD output. Harvesting marijuana seeds depends on your chosen variant. Cannabis, according to Higginbotham, can tolerate a DLI of up to 65, which is a significant amount of light in comparison. A general DLI of 5 to 10, 10 to 20, 20 to 30, and 30 to 50 are ideal for low, medium, high and very high light plants, respectively.
