What is the actual recommended light schedule for auto’s start to finish. Everyone has their own preferences but i was just wondering if there is a actual recommended light schedule for auto’s. Alot of growers use the 18-6 light schedule for auto’s and say if you go 12-12 it effects yields is this true?
It’s not really about amount of time lights on, has more to do with how much light energy is processed each day. The reference point for this is DLI, or daily light integral. In short, if you have enough light that you hit same dli on 12 hour schedule as you would on 18 hour schedule there will be no gain in yield running 18 hours as opposed to 12. If you run a dii of say 40 moles per day over 12 hours vs 40 moles per day over 18 hours and everything else is equal plants under each light cycle should produce the same amount. The kicker here is than on 12 hour schedule it requires a ppfd average of 925 umols/s/m² to hit 40 mols, but on 18 hour schedule only requires a ppfd average of 617 umols/s/m² . So you see people suggesting the longer schedule as way to increase dli without buying more light. No big deal, until you run into plants that don’t want to flower on the long schedule. And they come from all different breeders in all different strains.
This can be broken down into many conversations. Trying to pull every possible gram per ft² is different than trying get the most per kWh, and each individuals outlook can vary a lot. From this aspect, there is really no specific difference between an auto or a photo plant. The energy creates the yield and potency and really doesn’t make any difference how long it takes to get there provided so much light isn’t provided to harm the plant.