The best-yielding LEDs for cannabis in the flowering stage usually have a pinkish or yellow-white light. However, every model of LED is different
Spider Farmer SF-2000 LED grow light in action. This light yields up to 8 oz on a good grow with 1-4 plants. Grower comment: “Picture talks!”
You’re cruising Amazon looking for the best grow light. The number of options is overwhelming. Do you want standard LEDs, a quantum board, an LED puck, or something else? An HLG 300 or Mars TS 2000? What size do you need to get the results you want? Today you’ll get the answers to…
True power draw vs equivalent wattage – Whenever talking about the wattage, pay attention to the “true power draw” (how much electricity is being drawn out of the wall) to estimate the strength of the grow light. Ignore “equivalent” wattages because these are marketing terms without any objective meaning.
2.) What size grow light for a 2×4, 3×3, or 4×4 grow tent? (Metric 0.6mx0.6m or 1mx1m, etc.)
The result of those 8 plants was a big harvest only 3 months from germination. Who doesn’t love a quick bountiful harvest? However, more plants take more work. It was kind of a pain to take care of 8 plants at once in such a small space.
A single cannabis plant produces better yields if it’s trained to grow flat and wide, but that can add several weeks before harvest.
Why the confusing labeling? In the 2000s, the most popular grow light was the 600W HPS. When LEDs first came out, they were all labeled as “600w HPS equivalent” even though they used a fraction of that electricity and got a fraction of the yields. It makes sense as a marketing gimmick: doesn’t a “600w equivalent” light sound more powerful than a 100w LED? The practice of non-sensical LED labeling has persisted for over a decade, though it seems to finally be falling out of favor. You don’t need high wattage to get big yields, and growers are starting to realize the power of utilizing objective numbers instead of “equivalents” that are made up by marketing teams.
1.) What’s the best size grow light for X number of plants?
Each grow light is optimized to provide full coverage to a specific amount of space
So many different sizes (and types)! Which is the best grow light for you?
Yes. Much like a human sunburn, your plants can burn or bleach if you use too much light.
The simple answer is: it’s not really about wattage.
A lot of people believe that you need a 1000 watt artificial light to grow hemp indoors. The reality is, you can successfully grow medicinal herbs with far less wattage, saving you money on your electricity bill while growing healthier plants. So, how much wattage do you really need to grow indoors?
Those 400W are also giving you a fairly narrow grow light spectrum, so your plants end up not getting the amount of proper light they need.
How much wattage do you need to grow indoors?
The idea that we need 1000 watts to grow hemp comes from the days when it was common to use High Pressure Sodium (HPS) lights to grow anything indoors. At the time, HPS lights were the only decent artificial light source on the market, and a 1000 watt light was necessary for a sufficient photosynthetic light spectrum.
Let’s take a look at this short day plants-growing myth, and how you can grow indoors with eco-friendly (and wallet-friendly) LED grow lights.
Wattage is a measurement of electricity consumption, and while it’s helpful to know how much wattage your grow light uses (so you can make a more economical, energy-saving choice) it actually has nothing to do with the amount of energy your plants need to grow.
Where the myth that you need 1000W to grow hemp comes from
You can use a PAR meter to determine your grow light’s intensity in ?mol for light spectrum between 400-700 nanometers (nm) – in other words, for any light spectrum that’s suitable for growing plants.
The main problem with HPS lights (and other high-intensity discharge / HID lights) is that they end up wasting up to 60% of the energy they consume solely on heat output. In other words, if you’re using a 1000W HPS light to grow indoors, only 400W of that energy is being used for plant growth – the other 600W is being wasted, draining money from your pocket.
And that brings us to the most accurate method: using the actual output.
The good news is that they usually do provide the actual wattage somewhere. They often hide it somewhere far down the page, but it is almost always there.
that is exactly what I was looking for a led for growth and flowering that is as strong as a 1000 watt hps and has the same weight outcome I was wondering what kind of led lamp I should buy for a space of 5 x 5 feet at least 4 x 4 feet in growth tent I was told that spider sf4000 is possible but now I am happy that it is not and can be compared to one with a 400 watt hps that is very sad that you can never recommend it to someone who has a 1000 watts hps result
Using The Coverage Area Provided By The Manufacturer
Wattage is used as a good approximation for the amount of light a fixture will provide, but the actual output will vary greatly from one manufacturer to the next.
Say you have a 3×3 grow tent. That makes 9 square feet. At 30 watts per square foot you would thus want 270 watts in total. If you went up to 40 watts per square foot, you would want 360 watts in total.
What Size CMH Grow Light Do I Need?
Let’s look at the example from above again. The one with the 200 square foot area.
Even if they do provide output info, they often only take a reading dead center below the light, where the output is strongest. They do not give you readings for the rest of the coverage area, usually because the light is very weak around the outside of the area.