By Wattage to grow a plant with a high light requirement, like cannabis, you want 30 to 70 watts per square foot of canopy. I would go for a minimum of 50 watts per square foot. If budget and heat is not an issue, bump that up to 65 watts per square foot.So I think you only need a 480W LED grow light.

ECO Farm ECOR Samsung LM301H 480W Dimmable Quantum Board with Meanw...

The 3500K color spectrum has a good amount of both blue spectral output (400-450 nm for vegetative growth) as well as red spectral output (600-660 nm for flowering); The 660nm red and IR light is especially useful during bloom, where it speeds up flowering time and boost yields. UV light can speed up the germination process for starting seeds when grown indoors. As growers transplant seedlings to more intense light sources, UV strengthens the plants, better preparing them for high intensity light.
Update aluminum board is thick and sturdy, doesn't put out a tremendous amount of heat, high-quality protective covers for cables; 2 auto sensing power supply works on both 120VAC and 240VAC and 277VAC, suit for Large Rooms and Commercial Setups. Quality components mean the light lasts longer, but they also save you money.
Mars Hydro FC-E 4800 480W LED Grow Light

Consuming 480W input power, FC-E4800 has 2646 pcs high-quality BridgeLux chips, perfectly cover 4x4 ft (flower), 5x5ft(veg) grow space, more cost-effective compared with other same type lights.The newly developed chip arrangement by mars hydro enables a more even and efficient light distribution, thus promising growers a more uniform crop.
Wattage draw: 480W
HID equivalent: 1000 watts HID
LEDs: 2646Pcs High-Quality SMD LEDs chips
Spectrum: 380-410nm, 660-665nm, 730-740nm, 2800-3000K, 4800-5000K
Lifespan: 50,000 hours
Equinox 480W Led Grow Light 1000 LED Panel

The IF Lighting Equinox 1000 utilizes the latest LED technology available from Samsung to deliver an impressive light output 1057μmol/s.Drawing only 480 watts this light offers a 56% energy reduction when replacing a 1000W HPS light.Trichome production is increased by 15% - 20% and crop cycle is decreased by 7 - 10 days.
Cooling costs are reduced by over half. Expect 90,000 hours (20 years @ 12hrs/day) of use with less than 10% light depreciation.
1.ncreased Yields and Trichome Production
2.Lower Energy Consumption (480W vs. 1000W HPS)
3.Reduced Cooling Requirements
4.Robust High Efficiency Design
5.Additional Flowering Cycle Each Year
6.4’x’4 flower / 5’x’5 veg coverage
HYPHOTONFLUX HPF4000 Full Spectrum Led Grow Lights

Hyphotonflux 480w led grow light utilize the latest in high yielding LEDs technology today-lm301b diodes,it is equivalent to 1000w HPS grow light, high energy efficiency with 2.7 μmol/J,veg footprint is 6 x 6 ft, flowering footprint is 5 x 5 ft.The average yield is more than 2g/w, which means that you can harvest more than 960 grams per lamp,absolute value for money!
The led plant grow light have 1224 pcs lm301b leds(3000k+4000k) and 48pcs deep red leds(660nm),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.