Licht Wechsel Woche 7 Blüte

Go 16-18" with a mature plant in bloom (12/12) to start, and adjust if necessary. if you give 850PPFD you are up near max for ambient co2. raise/lower light based on plant growth to fine-tune it to your local variables. try an inch closer and observe for 2 weeks or more. when it is borderline, it can take a long time for light stress to show up. any excessive stretch and you know to get it closer for sure. over 18 hours in vege phase you only need about 500-600 ppfd. Or, about 66% of the above -- which is proportional to the hours of use difference 18 vs 12. can raise light or dim it. your light emits photons at a rate per second. rate x time = total energy applied. it doesn't matter if over 12 or 18 as long as you reach same "max" at end of day. you determine max through the observation process above along with this math to get you started in a better spot and faster learning curve. still need trial and error. Google daily light integral. the wiki covers it well.