Found this thread while looking for advice about grow lights. For future readers, I am necroing this thread to give a piece of advice to the OP, re: Pests.
In the ideal world, prior to bringing your trees indoors, you would be waging total war against pests, both real and imaginary. What that looks like for me is as follows: Prior to bringing a tree inside, I first hand-kill every single pest I can find by hand. Although gross, this is an important first step; reducing the population of insects ahead of using any sort of chemical will greatly reduce the likelihood that you end up with a resistant population. I then proceed to completely bomb-blast my tree with Neem, and by this I mean completely covering every leaf and drenching the trunk/ watering it into the soil as required. You can use something else if you like, but I prefer organics because my trees live with me in my bedroom.
Repeat this process every single day that I can get away with it (I may wait a few days between blasting sessions, if I am worried about the overall health of the tree,) until you cannot find a single pest. After that, I put the tree into indoor quarantine, far and away from every other tree that I own. During this quarantine period, I inspect the tree every day, and bomb-blast the tree every 2-3 days. Make sure that, when you are watering the tree, you make a good effort to cleanse the tree's leaves of excess oil. This will ensure that you maintain an acceptable level of leaf health during this time. Also, really water the stuff run into the soil. It will all wash out, eventually, but the whole point of this exercise is to ensure a healthy population of trees. That means killing whatever eggs/ pests might be in the soil, waiting to emerge and infest not one, but all of your indoor trees the very moment you get careless.
Respectfully, simply hoping that a fan will "keep the pests down" is not nearly enough. You need to go into indoor treekeeping with the mindset that the only acceptable amount of pests to have is ZERO. Besides the simple matter of not wanting to have unhealthy trees, the fact is that, if pests are not dealt with, you could completely lose new growth that would have otherwise eventually turned into ideally-placed branches. That may not sound so bad, if your tree is growing well. That said, your tree may never back-bud in that exact place ever again. This is a huge deal, if you have a certain vision for your tree and are intent on following it. Pests can add years to your development time and, in this hobby, where time is everything, that is simply unacceptable. Eliminate every single pest like your life depends on it, give your trees an appropriately sunny window, and care well for your them-- your trees will absolutely take off. Their health will improve so much, that they may even do better than they were doing outside. Yes, they do get more sunlight outside, but that's only one element of the equation, and available sunlight can be supplemented with good lights. On the other hand, you can never get a pest-free growing environment outside, no matter how often you spray them.
