Each 600 watt LED light has a coverage area of 3ftx3ft, and in regards to the height, it will cover between 18-24 inches. So if you have a 4ftx4ft tent that is 16 square feet of grow space; which according to the calculations of 9-square feet per plant, you would only be able to have one plant inside the tent with one light.
The plants need room not only to grow out, but they need the light to be able to “hit” all areas. If you have too many plants in too small of a space then you are limiting the plants'chance to produce a higher yield.

PHOTOBIO T Duo 600 Watt LED Grow Light

The scientifically designed PHOTOBIO•T Duo LED Top Light can be applied indoors or in greenhouse environments as a direct 1000W HID alternative or retrofit. Patented PHOTO•PRO Photon Regulating Optics ensure the most efficient delivery of plant biologically active radiation (PBAR) to the plant canopy. PHOTO•LOC Light Output Control allows precise control over the photons that are delivered to the plant canopy when used in conjunction with a 0–10V controller. In greenhouse facilities, PHOTOBIO delivers consistent optimal PPFD levels throughout the day while saving energy. Just pair PHOTO•LOC with an environmental control system that utilizes a quantum sensor to measure light entering the greenhouse and automatically regulate light output in real time.
Super Lumen Beam 600 Watt LED Grow Light

Here’s a complete product summary for you:
Super smart, super reliable 600W LED powered by Nanolux Technology
Incredible efficiency at 2.7μmol/W and a total output of 1700 PPF
Clever LED bar protection function isolates a failure should one ever occur
Digital control screen and buttons handily located on the side of the unit
Foldable, lightweight design aids transportation and storage
Dimming options include 100W, 200W, 300W, 400W, 500W & 600W
Random and soft start options help prolong the life of the product
Over-temperature and over-voltage features also protect the fixture
Rated IP65 waterproof, moisture-proof and dust-proof
Grow from start to finish with the Super Lumen Beam 600W LED Grow Light and enjoy a stellar performance all the way through the plant lifecycle thanks to world renowned Nanolux Technology, culminating in incredible yields and tip top crop quality. Rated 2.7μmol/W and 1700 PPF, the fixture operates at the very limit of what your plants can tolerate in a standard grow space (before needing to add supplemental CO2 and more headroom), pushing them to develop at a relentless pace. Keep on top of conditions and the results will be astonishing!
Crecer Lighting MetriX 600 LED Grow Light

The MetriX 600 is a linear horticulture lighting fixture that produces a broad-spectrum output making it an ideal choice for greenhouse and indoor cultivation facilities. The outstanding performance, productivity, and quality provide a higher benchmark among the rivaling solutions. The MetriX 600 offers growers the opportunity to generate pre-visibility, boost crop yield, and optimize quality throughout the season.

120-Degrees Beam Angle: With wider light dispersion, it does not create any hot spots; thus, dispersed light allows deeper canopy penetration.
Full Spectrum: The 12-band spectrum light replicates the natural sunlike spectrum and works great for culinary herbs, house plants, and various plants.
Wet-Listed: It conforms to UL1598 for dry/damp location, which means it can endure moist and humid outdoors for a safe and long-lasting installation.
100,000 Hours Lifespan: Save massively on the long-term replacement costs due to the fixture's long lifespan.
ECO Farm SP-600 Samsung Foldable Dimmable Full Spectrum LED Grow LE...

The led plant grow light have lm281b leds(3000k+5000k) +RED 660nm+IR 730nm +UV 395nm ,provides the plant with the full spectrum from seeding to flowering. Ideal for indoor plants all stages growing, rapid plant response from seed to flower,speeds up flowering time and boost yields. Low energy consumption SP-600,sp-800 growing light with 6bar and 8bar passive-cooled bars,aluminum heat-sink ,excellent performance in heat dispersing & lifespan, dropping 50% in electricity bill than HID lights.
it can cover 6x6ft growing area in Veg stage and 5x5ft for flower stage;SP-800 grow light use 2176 pcs high efficient Samsung LM281B leds,boast the market-leading efficiency to 2.6 µmol/J and 2.5g yield per wattage with 30% higher Average PPFD, the actual power is 840 watt, it can cover 7x7ft growing area in Veg stage and 6x6ft for flower stage.