If you still want to have more than one plant in a 4ftx4ft grow tent, then add more 600w Samsung LED Grow lights .Some growers will have four plants in this size tent, but they also accommodate the extra pl ants with more 600w LED lights.You need to consider for every plant, you need to have one light. On more lighting set up to consider to make sure all the plants received proper light exposure, even down to the smaller stems and buds, you can set up a pole at each corner of the grow tent and attach a light system to the pole so all the underneath of the plant gets adequate exposure.
ECO Farm ECOZ Pro 700W/1000W UV+IR LED Samsung 301H Grow Light Strips

Three channels: veg, bloom, UV.
It is a perfect top-lighting solution for commercial horticulture cultivation, or a full-cycle top-lighting solution for home hobbyists cultivating.
Full spectrum: the light include IR and UV which is similar to the sunshine, ideal for all kinds of indoor plants veg and flower at all growth stages.
GeekBeast 630W Pro Samsung 301H Chips+UV+IR Full Spectrum commercial LED grow light strip
Application: Full Plant Cycle Growth 
Working Temperature (°C): 10 - 40
Working Lifetime: 50000 Hours
Lamp Body Material:Aluminum
IP Rating: Ip33
Certifications: CE, UL, EMC, LVD, ROHS 
Light Source: LED 
1 year warranty on PCB board 5 year warranty on Driver
It is clearly that the first grow light is better. If you are also interested in other eco farm grow light , welcome to visit our official website: ecofarmgreeninc.com