co2 question

I am thinking of adding bottled co2 to my room. I have about 40w per suare foot of light right now. Will I still get the benefits from the co2 with this(20-30% increase in yield) or do you need to have more than the ideal 50w per square foot of light for the co2 to be effective. Thanks

just dont think you are going to magically get 20-30% more. i waited to add co2 to my sealed room until i had a bunch of harvests with the same nutes and strains and i had it dialed in but i still didnt see that improvement, maybe 16-18%.