The ROI-E680 is the ideal balance of size and performance for the experienced hobbyist and professional cultivators alike. The E680 is a more portable and lightweight fixture suited for cultivation with moderate space availability, tents, vertical gardens and any commercial application facilitating 4x4 canopies. The ROI-E680 is a very powerful fixture and a proven versatile workhorse in any kind of garden, producing hefty yields and top quality harvests.
Grower's Choice does suggest the E680 be used with CO2 supplementation to support a healthy cultivation and the largest yield capacity.
Without utilizing CO2 the grower might be presenting more light than the plants can process, possibly causing stunted growth or light damage. Know your garden and provide light accordingly.