its not a 2x2 space or tent or room, it is a plant in a room of the home, no reflective surfaces, nothing but a few lights over a plant he has patiently "trained" for months. lots of time and effort on the training, but nothing else at all. no time on the not great lights, no time on temp controls or humidity controls (i may be wrong, but it would seem impossible to control the plant environment with it just sitting in a room) so the effort and whole "thing" here seems to be a desire to pinch and pull plants till they scream (yes, they do scream and remember you when you come back!). i find it difficult to think this is for any other reason than the originally stated "therapy". so i encourage you to have fun and enjoy the process, but dont count your chickens yet, or your therapy might make you need therapy!
instead of a new light or more light, use some inexpensive panda paper and set up an area, or a tent or a space in the closet - whatever works. but do the minor things that might make you some yield, or... keep going with the therapy and follow your heart. so much stress over the one thing, training, and none over any other aspect of the grow just doesnt seem prudent...
max yield would take you getting serious about more than the training. you can train the stuffing outta this thing, if you dont do the rest, you wont get the yield. <---- that dot at the end, that is a period. you are not only not doing "the rest" you are insulting people trying to help you get what YOU want! they are sharing some science and experience points trying to help you (you - the guy who doesnt know that is how they are LEGALLY SUPPOSE to label LEDs & the guy who did no led research because that thing about wattage is the first thing they tell you about leds, the guy who has no reflective surfaces or really anything but a butchered plant and a bad light hanging over it. looks like you have to heat and humidify an entire room or home just for a little sickly plant that is not so big, that cant be cost effective, or even condusive to your own health.
see the pretty green bushy plants he showed you, then see yours? just at a glance, im going to say, his - healthy, yours - not so much healthy.
but you are using it for therapy, so the rest is just meaningless for you. ever watch butch n sundance? you just keep thinking Butch, its what youre good at!