A good quality LED grow light is a must investment for a 4×4 tent. You have made a great effort to grow plants indoor with an efficient control system through a grow tent. But to yield higher from their indoor garden, you need to have a proper light setup for your plants. Every grower knows the importance of light in the growing cycle of plants (veg, bloom, flowering). So, choosing the best grow light setup for your grow tent is very crucial. 

Here we will review the grow lights that have enough lumen/PAR to cover your 4×4 tent. The 4×4 tent is a great size as it's not too big or small. The lights that can be used in a tent this size vary dramatically. You can use almost any fixture from traditional single-ended fixtures, LED lighting, or Ceramic Metal Halide. The only fixtures that might be avoided are double-ended fixtures but that has more to do with height restrictions. 

How Many LED Watts For 4×4 Grow Tent?

How many watts do I need for a 4×4 grow tent? Generally, 1 square foot of grow space requires about 32w of actual wattage of power for flowering. For the vegetation stage, you'll need around half the power (25w).

4 feet x 4 feet = 16 square feet

Flowering stage: 16 square feet x 32 watts = 512 watts actual power. ( Recommended: 512W-650W).

Vegetation stage: 16 square feet x 25 watts = 400 watts power. ( Recommended: 390W-450W power).

This means you need to get LEDs emitting an average of 512–650 wattage. However, it doesn't mean this provides highest yields for your plants, hence the long answer.

LED Grow Light for 4 by 4 Grow Tent

ECO Farm ECOY 600W Movable LED Grow Light Bar with Samsung LM301H Chip

Features:

The ECO Farm grow light is equipped with high-quality Samsung LM301H diodes and 6 high-efficiency aluminum rods to ensure high-efficiency PPE 2.5umol/J, better heat dissipation, and long service life. 6 LED growth lights, each rod is covered with high-grade glue, waterproof and easy to clean, not easy to be filled with dust. Higher Light Intensity, Better Coverage, More advanced features (each single grow light bar can be movable as your own idea). No need to worry about differences. At the same time, it also has an ideal full-spectrum: excellent full-spectrum mixing of white, blue, red, and ultraviolet light, Samsung 301H 3500K+270 Epistar 660nm, close to natural sunlight. Finally, it is a fanless and zero-noise design, which is very quiet.

Wattage draw: 600W 
LED chips: 1260 Samsung LM301H and 270 Epistar 660nm 
Power: Mean Well HLG-48B
Luminous Efficacy（umol/J）：2.5 
PPF： 1715
Lamp Luminous Efficacy(lm/w): 160
Lifespan: 50,000 hours
Support Dimmer: Yes
Working Time: 50,000 hours
Application: Seeding Starting, BLOOM, VEG, Flowering
Input Voltage: AC85–265V
Lamp Luminous Flux(lm): 96000
Certification: CE, EMC, FCC, LVD

New Mars Hydro FC 6500 650W LED Grow Light with Samsung LM301B Osra...

Features:

High-Quality Efficient LEDs Chips 3144Pcs Best-Selling Samsung LM301B and Osram 660nm LEDs chips, High Efficiency Up to 2.9 µmol/J.Upgraded Sunlike Full Spectrum White This High-intensity spectrum is beneficial for plants at all stages - from veg to bloom, and creates Big density Buds. Increased Crop Quality Expect up to a 50% higher yield and higher quality compared with the old blurple lights and HPS. Max yield Up to 2.5g/W with 30% higher Average PPFD. No-Fan Design, Aluminum Heatsink, and Removable Driver The no-fan design makes no noise; IP65 Waterproof, Flexible 180-degree movement Give growers a worry-free while growing in humidity environment; Foldable design up to 180 degrees, making it small, compact, and easy to install.

Wattage draw: 650W 
Amps: 5.48A 
HID equivalent: 1200 watts HID
LEDs: 3144 pieces Samsung LM301B and Osram 660nm LED chips
Spectrum: 2800–3000K, 4800–5000K, 660–665nm Deep Red
Lumens: 121373 Lm
Lifespan: 50,000 hours
Driver: Dismountable Meanwell and inventronics driver
PPF: 2.9 umol/j
PAR: 2268 umol
Coverage area: Flower: 5 x 5 feet | Veg: Up to 6 x 6 feet
Operating/input voltage: 100–277V

GROPLANNER LED GROW LIGHT 640W- GROPLANNER I SERIES

Features:

This GROPLANNER LED grow light has a balanced lighting design, which is enough to cope with complex indoor use environments. The actual power is 640W, and it provides PPF output (1750μmol/s), allowing you to obtain a higher output of 30% to help you achieve maximum quality and Quantity, better than the traditional growth system. It is very suitable for 5'x5' plant coverage and 6x6 reduced coverage, which greatly improves the light coverage. The advanced design effectively expands the light area. At the same time, the lighting is more uniform. With a high energy efficiency of 2.75 umoll/J, it also provides a high-quality and complete natural spectrum from 400nm to 700nm. There is no need to worry about heat dissipation even with high power. 

Power consumption：640W
Light Color：Full Spectrum 
PPF: 1750μmol/s
Efficacy：2.75 μmol/J
Dimming：0–10V
Heat：120°F
Lifetime : >60,000 hrs
Input Voltage：120–277VAC，50/60Hz
Thermal Management：Passive-Cooled Design
Coverage：5'*5' for Flw, 6'*6' for Veg
How to Choose the Right LED Light for 4×4 Grow Tent

All the led grow lights don't necessarily mean the best for YOU! For it to be that, you need to compare your requirements with the features the model offers.

Now that you have seen the models, consider these factors before making your purchase. That way, you won't buy something only later to regret it. We always suggest not going to cheap grow light for your grow tent.

Spectrum

A light bulb with a different wavelength ensures maximum growth. Plant from stage to the stage requires a different light spectrum –a full spectrum includes red, white, and blue light, also infrared and ultraviolet lights.

Also, full-spectrum lights come with adjustable settings with VEG and Bloom switch, providing flexibility in the growth process. Nowadays most high-end models are engineered to work exceptionally well in flowering as well as vegetative plant growth cycles.

Light Intensity

Having too much light or having not enough light - can be harmful to the growth of your plants. You need to have the right amount of light intensity for the plants to be healthy. To get a balanced intensity, you need to consider the plant's growth stage and the size of your grow space.

The most ideal intensity (lumens) ranges from 300 to 800 lumens for every square foot. If you do not get sufficient light intensity from your single light for every square foot, you can use multiple led grow lights.

PAR

PAR refers to 'Photosynthetically Active Radiation.' It is the range for all the different wavelengths/colors of light that plants use for photosynthesis. Your light should have all the different wavelengths/colors but especially important are the blue wavelengths for vegetative growth and the orange/red wavelengths for the flowering process. You should Look for High lumen and High PAR Value Features before buying any light.
The plants under the middle of the light receive the full PAR value while those at the edges may get less light. A high PAR is not necessarily better. Actually, high-quality light has lower PAR values because the power is distributed evenly rather than concentrating in the middle.

Energy Efficiency

The LED grow lights operate 8+ hours per day and it takes a huge toll on your electricity bills. In that case, look for an energy-saving light providing optimum performance. Your light should use less power but offer mimic of natural light and full coverage. But also you have to ensure sufficient light.
Moreover, it must be able to operate for at least 10 to 12 hours each day. Before buying, search up the wattage of that model to find out how much power the light will consume.
Easy setup and Maintenance

Usually, cheap items burn out faster and need to be installed frequently. That way maintenance costs also keep piling up. A High-quality led lighting system may be more expensive but they'll save you from any extra cost.

Also, look for lights that are easier to install so that you don't have to call professionals and pay extra charges. If you know grow light setup and care for your light fixture, it'll save you tons of time, money, and energy while growing your plants.

Material Quality

The ideal grow light for a 4×4 tent should be durable, environment-friendly, and made up of good quality material. Consider the product information provided on the instruction manuals or boxes of the lights.

Also, check if the products have undergone safety tests and whether they abide by the highest industry standards or not. You'll know a high-quality product from its reputation and performance giving you the best value for money.

Conclusion

You need to be careful regarding the height at which you hang the light above the plants. As it can cause a burn or stunted growth in plants. It is recommended to keep the light at a distance of 30–32 inches at the start. Then you can closely monitor the plants over time to avoid any burn and allow for a proper stretch (depending on your area size). If there is a stretch between the nodes or too much space between the sucker leaves, you can decrease the height of LED light and further adjust it unless an optimal height is achieved to maintain healthy plants' growth.