50 and up.....then you are getting in the needing additional CO2.
Thanks, looks like I'm buying a ppfd meter now.
Lol woah slow down. A lot of times you can get ppfd readings from manufacterers ( only trust the more honest brands tbh) so you don't need a meter. If you do, go with an apogee meter. You might as well go with the best brand when it comes to things like this.
I'm not super familiar with the upper limits, but I know that if you go high enough you will definitely need co2.
The Korona Apple App is pretty damn good. We checked it a the hydro shop and it was within 5% accurate of their MQ-500 rental unit.
I made a thread on that app, but it didn't seem to be a hit.
IMO with LED you want 35 to 50 watts per square foot. Don't dig too far into par and such, just get a reputable dealers light and you will have a good idea of what the light does. So in your 4x4 space with 16 square feet I would shoot for between 560w to 800w. I have the same size space and use an HLG 600 Rspec, the plants love it and there is not too much heat. That said the HLG is an expensive option, there are many alternatives. I can say this light kills it in this space thought. Gives me 37.5 watts per square foot. Just my opinion.
Ya, I saw that that thread and you became my new personal hero for saving me $500. I was gonna pull the trigger on the Apogee.
I'm glad it helped at least 1 person.
