THIS.
Compared to HID lighting, LED emits much less infrared and thus plants need higher temperatures to properly transpire.
Better insulation of your grow space will preserve your power savings. You had to shed excess moisture before you switched; how was that accomplished?
Raising temperatures will naturally reduce RH. Give it a try, keep us updated.
Different lights with different characteristics need a different approach. When you get it right, you'll like the results. I sure did!
Ok I have installed another wall panel heater today, they are fairly low in power consumption. I am in the tale end of winter over here so the room is currently quite cold 22c. The extra heater should bump that by 2 or 3 degrees. Summer is just around the corner which will help bring the temps up further which will then be easier to maintain the room at around 29c as recommended. I have also aerated my coco with perlite on a new batch of clones. I will see how these changes do over the next few weeks and as a last resort add some IR.
The rooms is a brick room which is quite well insulated except the concrete floor, I could maybe get some rubber mat to cover the floor but conditions are quite stable.
I have an 13" inline exhaust fan with a passive intake that has always kept my humidity in a decent range for vegetation. I also have multiple oscillating fans on the canopy.
Overall I'm loving the COBS, the plants that do ok seem to have massive stems and stack tremendously but they are just not sucking up enough water and it's very easy for them to get over watered.
Ive got them at around 38" above the canopy which is a bit high but any lower and they don't want to grow up and start leaning to the sides. This is another reason I know I have enough light.
Thanks so much everyone for the input, Ill post again in a week or two with an update on the new clones and heater. If that combo doesn't quite do the trick then Ill start playing with the IR.
Cheers.