Proper CO2 levels?

[northernkush]

Can anyone help me out with the following question below?

If CO2 is being used, during what weeks of the growing cycle is it not necessary or in fact, detrimental to crop health? What is the maximum CO2 ppm you should ever have in your room?

Thanks a bunch guys!

 

[growsjoe1]

The facts about CO2 ppm: don't use 1,500!
by spurr

https://www.icmag.com/ic/showthread.php?t=221893

very good reasons to run between 1100 and 1200ppm...the how and why of it

growsjoe1

 

[northernkush]

Thank you Growsjoe

 

[supermanlives]

i think spurr had a thread about co2 levels