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, emitting almost the same PPF as a conventional 1000w DE HPS fixture and lamp. With extreme PPF, 3k full phase spectrum and balanced PPFD the ROI-E720 has the ability to generate the greatest yields and superior quality. GC highly advises this device be utilized in professional, environmentally controlled cultivation that supplement CO2. Without using CO2 the cultivator might be exposing more light than the plants can handle, potentially causing stunted growth or light damage. Know your garden and supply light accordingly.