What Size LED Grow Light Do I Need For Growing Weed?

Making the right selection involves having enough information about the different options available in the market and how the different lights they produce can be beneficial to your plants. When looking for Grow Light that is specifically for growing cannabis, you need to get a full cycle LED light. However, you should be aware that you may only have to use it in the vegetative and blooming stages. Other factors you should also take into account include the area of coverage, the type of chips used, the amount of heat produced among other factors.

What Size LED Grow Light Do I Need? 

For optimum yield, A good rule of thumb is to choose an LED grow light that outputs at least 50w per square foot of grow space. Make sure that the light can draw 50w from the wall (not the combined capacity of the LED’s) Example: a 2ft long x 3ft wide grow space would require a 300w LED grow light

The most important bit of equipment in your grow room is your light.

Why? Light is your plant’s food, you need to feed your plants high-quality food for them to produce high-quality yields.

LED lights for weed are now considered the best lighting option by most growers due to their energy efficiency, durability, and full spectrum.

However, with all the options and technical jargon, finding the right light for your project can feel a little overwhelming.

To work out what size of LED grow light you need, you first need to calculate the exact size of your grow space.

Taking Into Account The Size Of The Grow Space

In LED lighting bigger wattage doesn`t automatically translate into a bigger area coverage, as it is with regular HID, MH and HPS lights, but it can still serve as a good rough estimate. However, the most accurate metrics are the so called Photosynthetic Photon Flux Density (PPFD) and the Daily Light Integral (DLI) that serve to determine the number of lights to the power of lights ratio, but for simplicity and coherence we`ll use wattage as the metric to determine the light coverage area.

Plants and especially cannabis need most lighting during the flowering stage, so we`ll be using that as an estimate of how much area needs to be covered. A standard LED grow light must use more than 32 watts per square foot of grow space, but for optimum results it should be over 50 watts, up to 80 watts.  

Consult with the following bullet points if you need a quick guide for calculating how many watts you need for a given grow area.

• 1 by 1 – 32 watts


• 2 by 2 – 128 watts


• 3 by 3 – 288 watts


• 4 by 4 – 512 watts


• 6 by 6 – 1152 watts

By following these simple steps, you will easily choose the LED lights to ensure a lush and healthy garden:

Measure your garden’s length and width.

On each of our product pages, you will find the coverage areas of each size light. To determine the number of lights you need, divide your space up into these coverage areas. Core coverage is the idea space for flowering plants, so use that metric for all full cycle or flowering gardens.

Are you replacing other grow lights, such as HPS, or would you like to have the same or higher intensity of a particular wattage of HPS? If so, exchange the lights using the following guide:

Is your garden for vegetative cycles only, flowering only or full cycle from seed to harvest?

The Diamond Series, Diamond Series XTE, and Diamond Series XML are all designed to grow plants from seed to full harvest, and they are optimized for flowering and fruiting plants.

If you want a focused vegetative led grow light that is all blue for green leafy plants to use in veg rooms only, the All Blue Extreme Veg light is your best choice.

By using this guide, you’ll choose the best LED grow lights for your indoor garden. We provide a 90-day, 100% risk-free guarantee of your satisfaction with our highly rated LED light products. If you have any warranty issues, we provide free replacement parts with the shipping paid by us within 24 hours.

If you have any questions, give our friendly Advanced LED Lights experts a call at 1-800-401-6307 or visit our contact page.

ECO Farm ECO Blue 120/240W LM301H Quantum Board

This 240W quantum board LED is best and beautiful, which is popular with growers.

Upgraded ECO Blue series growing lights have a dimming knob. A single light can be adjusted the light intensity at liberty.

Excellent full spectrum- 3000K/3500K diodes providing more reddish light. The 660nm red light is especially useful during bloom, where it speeds up flowering time and boost yields. Turn your seeds into your own supply. And the light looks fairly natural, so it's good for accurately monitoring plant health.

No Fan Noise Free. High Safety performance MEAN WELL Driver, Fair Waterproofing. Update aluminum board is thick and sturdy, doesn't put out a tremendous amount of heat, high-quality protective covers for cables; User-Friendly Packaging. Quality components mean the light lasts longer, but they also save you money.

ECO Blue is designed with a special color - Tiffany blue.

500W LED grow light

Eco Farm Commercial Indoor LED grow light uses our custom designed full-spectrum high efficiency 1560 LM301B white chips+36 Osram 660nm Red chips.

50W Enhanced Bar with UV(25W) and Far red(25W) optional.

Far-red light causes plants to stretch out and reduces the amount of chlorophyll (which is essential for plant growth) in leaves. When used for a short period, far-red light can stimulate flowering.

UV-B can induces a range of strong morphological effects in plants, including leaf thickness, leaf discoloration, cotyledon curling, inhibition of hypocotyl growth, stem and leaf elongation, axillary branching etc.

600W LED grow light

1. Original Samsung LM301B/ LM301H LED Chip.
2. IP65 waterproof silicone coating.
3. Samsung Normal Spectrum: Full Spectrum, 660nm+730nm, 660nm+730nm+385nm.
4. Timer can set up the automatic on/off time to manage the plant growing cycle.
5. Non-welded DC connection mode, easy to repair and replacement.
6. Applicable to diversify greenhouse vegetables, flowers and plants for cultivation lighting

Full Spectrum LED grow lights are getting increasingly more sophisticated and setting the new lighting standard for the horticultural industry. We hope that you`ve found the information useful and can now make a more informed decision. The market is saturated with many products and brands but we believe that quality makes itself visible.