The ROI-E720 is a user-friendly commercial grade device. But, Grower's Choice does not recommend the E720 for inexperienced cultivators or tent applications. The E720 is developed as a high output device for commercial cultivation, producing nearly the same PPF as a standard 1000w DE HPS fixture and lamp. With intense PPF, 3k full phase spectrum and balanced PPFD the ROI-E720 has the potential to produce the highest yields and superior quality. GC strongly advises this fixture be used in professional, environmentally controlled cultivation that supplement CO2. Without using 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 appropriately.