What Size Grow Light Do I Need? (The Simplest Way To Figure It Out)

How much area are you looking to light?

The best place to start is to figure out the square footage of the area you are trying to light. For high-light plants you will want to achieve around 40 watts per square foot for optimal growth and veg production.

For low light plants, and small leafy plants like herbs and lettuce, you will only need to achieve about 25 to 30 watts per square foot. When figuring your area don't necessarily go by the actual size of the room. You will want to measure only the plant area that you will be growing in.

You can also find in-depth information on PPFD metrics here. In the meantime, we’ll lay it out as simply as we can.

PPFD tells you how much photosynthetically active radiation (PAR) actually reaches the canopy from a specific hanging distance. This is a measurement of the amount of usable light that makes it from the lamp to the leaves.

For healthy, flavorful plants, follow this guide:

Seedings and clones: 200-400 PPFD
Vegetation: 400-600 PPFD
Budding and flowering: 600-900 PPFD

‘Listed Wattage’ Vs. ‘Actual Wattage’
LED grow lights in the market have a certain wattage printed on their specs chart. Say, it’s three watts for a particular model. But if you run them at 3W electric power, it will burn out!

So, it’s best to run them on a 60% power of what’s listed. We’re calling it the ‘Actual Wattage’ for instance. And from this point, everything we’ll talk about is the actual wattage, not the listed one.

 MAXSISUN 1000W PB Series Quantum Board

MAXSISUN 2020 Latest QB Style PB 1500 LED Grow Light, Sunlike Full Spectrum LED Grow Lights for Indoor Plants Veg and Bloom, Plant Growing Lamps to Cover a 2.5x2.5ft Flowering Space (450pcs SMD Chips)

The strongest point of the Maxsisun PB series is that you get quantum board LED grow lights at a much lower price. These lights have many other strengths as well, but as we’ll see, they lag behind HLG or Spider Farmer lights in every aspect except price.

Eco Farm 240W Quantum Board LED Grow Light


Eco Farm120W/240W Quantum Board LED Grow Light


The sleek and beautiful Eco Farm quantum board LED grow light runs on 240 watts with MeanWell driver. Besides, it is made of Samsung LM301B LED chip.

With the full spectrum lighting, your plants will get the required light colors for different stages of growth.

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.

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