The ROI-E720 is a user-friendly commercial grade fixture. But, Grower's Choice does not recommend the E720 for inexperienced growers or tent applications. The E720 is manufactured as a high output fixture for commercial cultivation, producing nearly the same PPF as a standard 1000w DE HPS device and lamp. With intense PPF, 3k full phase spectrum and balanced PPFD the ROI-E720 has the potential to generate the greatest yields and superior quality. Grower’s Choice strongly advises this device be used in professional, environmentally controlled cultivation that supplement CO2. Without using CO2 the grower may be exposing more light than the plants can process, possibly causing stunted growth or light damage. Know your garden and provide light accordingly.