Best LED Light for 4×8 Grow Tent (Ultimate Guide)


Deciding which light to put on your grow tent, can be a pretty tough choice to make. You want to provide natural sun-like light to your budding plants, but also you don’t want it to burn-off. You know the room needs rapid cooling to avoid getting over-heated. But again at the same time, you can’t let the noisy fans disrupt the quiet environment for your plants’ growth! Then there’s this issue, which light to choose for which plantation stage?

In the tight-packed schedule of daily routine, surely you want a higher yield with increased harvest. Still you wish you didn’t have to check on the room light adjusting now and then, every two-three hour! Well… What’s going to amaze you is – all your confusions actually have a pretty simple solution – using an LED Grow Light! If and only if you’re into healthy gardening with lesser cost, LED light certainly tops the best choice available on market.

Might not be so easy as sounds, but certainly there are always strategies to do a bit research and choose the smarter one!

Here’s a little sneak peek over the top choices of 2020 – the five best LED lights for 4 X 8 Grow Tent, just suitable for your next successful gardening venture – be it an indoor or, commercial one.

What Size of LED Light is Needed for 4×8 Grow Tent?

Determining your LED light size is basically a two-steps process. First, you need to calculate the size of grow space and second, find out the canopy dimension.

People often ask us, how many Watts need for a 4 x 8 grow tent. Well, keep your eyes hooked below for the answer!


To produce a favorable yield in flowering period, you need a LED light with an output of at least 50W per square foot of growing space. Now your 4×8 grow tent is 4ft long and 8ft wide. Which gives you a square foot grow space of (4ft x 8ft) = 32. And then, multiply this figure by 50W: (32 x 50)W = 1600 W.

This means your 4×8 indoor grow tent requires an LED grow light bulb size which is at least 1600W or, you can use a combination of multiple LED grow bulbs which will be totaling to 1600W.


In the vegetation period, you need only half of the power compared to the previous flowering stage. In simple words, if you needed 1600W in the flowering stage, then in the vegetation stage you will require: (1600 ÷ 2)W = 800W.

This implies in future vegetation period, your 4 x 8 grow tent will require an LED grow light bulb size of at least 800W, or you may combine multiple LED lights which will total to 800W.

How many lights are required inside a 4 x 8 grow tent?

  • A single MARS TS 3000W covers 4 x 4 tent area. Hence to cover 4 x 8 grow tent, you need 2 MARS Hydro TS 3000W
  • A Spider Farmer SF-2000W covers 2 x 4 tent area. Hence to cover 4 x 8 grow tent, you need 4 Spider Farmer SF-2000W lights.
  • A single MARS SP 250W covers 4 x 2 tent area. Hence to cover 4 x 8 grow tent, you need 4 MARS SP 250W

Most Used LED light for 4x8 Grow Tent


Product Name

Key Features


Best Overall


Premium Pick

King Plus LED Grow Light

Great Value

Spider Farmer LED Grow Light


King Plus Full Spectrum Grow Light

Key features

Mars Hydro, a brand specialized in highest yielding LED grow lights – takes pride in its TS 3000W’s professional manufacturing potential – claiming maximum customer satisfaction! A brilliant product as it is, TS 3000 exhibits a full LED sunlight spectrum, ensuring sufficient nutrients in each growing stage of any kind of plant. The additional invisible IR light not only promotes blooming and fruiting, but also increases yield of plants and flowers up to 30%.

An innovative fan-less light board design works as a dual-purposive system. While providing a quiet environment for the plants to thrive, simultaneously the reflective Aluminum hood disperses heat quickly – supplying more energy to growing plants – without causing burns.

This proficient-energy saving TS 3000W LED light helps the PPFD increase by 20%; achieving success for Veg footprint 5′ x 5′, 4′ x 4′ and Bloom footprint 4′ x 4′. Most of indoor gardeners recommend this led light for 4′ x 4 grow tent for bloom growth stage.

Additional accessories include two waterproof, dimmable mean well drivers. Used in both commercial setups and large rooms, its auto sensor power supply functions on 120 VAC, 240 VAC and 277 VAC.

What I Liked

What I Don't Liked

Key features

A sterling LED output from 15 years of intensive experimentation – the UL 4000W – has added another dimension to the King Plus’s UL series. Its engineering enables the scope for a higher lumen and favorable coverage, leading to increased yields. The Blue, White, Red and IR together creates a full spectrum, providing the plants scope for natural sunlight growth.

With a simpler structure, the light board makes sure not to generate any noise. Its customized protective cover makes the panel water-proofed. The Aluminum alloy adds to its strength compatibility by heating the plates at a lower temperature.

This energy-saving tech of UL 4000W LED provides a very bright uniform coverage – to grow high quality products – in essence almost doubles the service life.

Additional accessories include power cord, hanging kits, glasses and adjustable rope.

What I Liked

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Key features

With the motto of heaviest yield from healthier buds, each Spider Farmer light of SF-2000 LED series undergoes 72 hours of multiple testing, monitoring and only after that, qualifying! An

excellent combination of full-spectrum accelerates the flowering time – as a result, the yield is multiply boosted. The natural sunlight aura ensures the accurate growth of your plants’ health.

Advanced dimming function makes the functioning even easier – either dimming single light with a single fixture or, using multi-connection to dim all those lights at once! The potentiality to operate without the need of fans, enables a quiet, healthy environment for plant growth. A thick- sturdy Aluminum board reflects only a sufficient amount of light, putting off the extra heat.

This cost-effective SF-2000 LED light is sure to produce a higher PPFD, with 50% more harvest, achieving success for Veg footprint 3′ x 4′ and Flowering footprint 2×4. 

Required input voltage is operational on both AC100V – 277V. Additional accessories include mean well drivers and others.

What I Liked

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Key features

Another magnificent LED light by Mars Hydro – the SP 250W provides scope for plant growth in multi-sectoral environments as in tent-grow, greenhouse-grow, home-grow or even commercial flower shop-grow! The safety and ease in plant growth are further ensured by casings- capable to sink the heat.

The SP 250W exhibits a full spectrum light which includes UV and IR LED grow system. The UV system increases the functioning temperature for flower plants to a favorable extent. At the same time, the invisible IR light convenes plant growth through the promotion of blooming, fruiting and increased yields up to 30%.

Similar to TS 3000W, the SP 250W also features a unique fan-less light board design – in which the high-reflective Aluminum hood disperses heat through core coverage and assures free-of- noise environment for premium plant growth.

An efficient-energy saver as this SP LED light is, accelerates the growth for Veg footprint 3′ x 6′ and Bloom footprint 2′ x 4′ – increasing the PPFD up to 20%.

What I Liked

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Key features

The never-stopping brilliance of King Plus brought in another perfection – the 3000W LED grow light. Its success got validated only after 72-hours long crucial tests. From a wide range of 380 nm to 780 nm, it features a natural sunlight like full spectrum – fruitful for all kinds of vegetables and flowers.

Uniqueness of this Kings light is the Veg/Bloom switching to facilitate different growth stages rightly. The proper switching ensures a bumper harvest for seedling growth and flowering.

Another specialty includes the muted high-speed fans system to ensure rapid cooling. Within a lower operating temperature, the upgraded Aluminum radiators supply enough heat – creating a comfortable environment for your plants.

An effective power-saver as this 3000W LED light is, will require a minimal input voltage of AC 85V – 265V, on an average consuming nearly 508W – 615W of electricity only.

What I Liked

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Thoughts of the Final Hour

It’s quite natural to feel a bit lost amidst the over-tempting choices in market. And trust when we say, happened to us in our initial days too! Which is what took this research team – days of

extensive research to determine for a 4 x 8 grow tent – the best available LED lights on market. Hopefully, you will make the ‘smarter’ choice in lightning up your 4 x 8 garden heaven.

Take some time, judge the reviews and compare between your desired products. Here’s to your fruitful harvesting!

Also you can use these led grow light in other sizes grow tent like 2×2 grow tent, 2×4 grow tent, 3×3 grow tent, 4×4 grow tent, 4×8 grow tent, 5×5 grow tent, 8×8 grow tent, and 10×10 grow tent.. Keep in mind that these grow tent requires different wattage light.