The ROI-E420 was especially developed with the hobbyist "in tent" applications and cultivators who need a compact led fixture that generates high photon output. The e420 is excellent for tent grows as it's compact design alleviates growth space while still supplying high energy output to the canopy producing remarkable yields during bloom. The E420 is also great when used as an efficient veg device in large scale and commercial cultivation as the 3k full phase spectrum supplies all the PAR needed for all stages of plant life. It is not necessary to run CO2 with the ROI-E420. However, additional CO2 between 450-800 ppm will be helpful and also increase yield capacity.