Nice plants to start with, mate, and a really good light. Timber or diyled.uk? And you're right, all seems to be a little faster with LEDs. They will also finish earlier especially under CRI90.
If its your 1st LED grow make sure to keep the humidity under control. Air tends to dry out quickly under strong LED light and if the humidity gets too low the plants are forced to drink much more water (because of the high vapor pressure deficit or VPD) and this can end up with excess nutrient uptake. In most cases the first signs of a too low humidity/too high VPD is a magnesium deficit which occurs within a few days and is caused by too much calcium uptake. It gets locked out and it takes a while to get the plants back in good shape so its better to avoid VPD issues from the beginning.
If you don't know that before switching to LED's it can be a serious issue. I myself learned it the hard way. Luckily youtube is full of explaining videos and you also find info online. Even grow controllers with VPD settings are available but they need a humidifier to work.
But there are two ways to deal with it.
You can either increase the humidity to at least 60-65% and you're fine in most situations or you lower the nutrient strength accordingly to allow the plants to drink more water without uptaking too much nutrients. Lets say the VPD is 20% too high(or humidity 20% too low) you can simply give them 20% less nutes and the nutrient uptake will stay within a healthy range.
Good luck, bro! I'm pretty sure you'll beat you hps yield record with the 1st try. This light is bad ass
Hello guys,
Very interesting inforamtions here.
Air tends to dry out quickly under strong LED?
I have to say that i have problems to go below 58% humidity with 5 x 240W pannels. I let my room temperature going up, until 30 celsius, but my leaf temperature is 25 celsius maximum who gives me a poor VPD of 0,7. Whith a 45%, i would be ok with the room temperature + leaf temperature, but it is impossible to reach 45% for me at this moment.
The plants themselves looks to increase the room humidity a lot. Have a 1100m3/h running 24/7 at 70% capacity. Tried 100% capacity and even less. 58% is the lower i can get.
I dont really want to run my dehumidifier, because the air gets hotter, while the RH goes down, and i cant get any stable VPD witht his. Plants are looking nice, and they are growing well, BUT, i can clearly see that they are not eating as much as they are supposed to. I can't go over EC 1.1 and they are now starting their 5th week of flower.
I got some cal/mag issue all over the grow, i now understand why. They seems to need always more and more cal/mag.
I wish my air id drying, but this is not the case. I have IR leds on all my panels, and i can't increase leaf temperature. In fact LST seems to be the same lights off, at a room temp of 25 or 30. Have to IR guns that measure the same thing.
