heres my issue is that i have some citrus trees im growing out to let the trunks thicken up, they are quite tall id say 2.5 feet tall right now so them on a shelf with a 12" spacing on the light already takes up more then half of the shelfs total height, then I have around 2.3 feet to fit the rest of my trees in, this was my thinking that if my lemons grow taller over winter I want to be able to dim the lights so I dont bleach the leaves. However I could always just keep pruning them down during winter so I will see how much of a price difference dimmable to non dimmable lights are
The problem with that approach is that you dim the light for the rest of the tree based on the relatively few leaves in the "danger zone". It might be better to let whatever gets that close burn.
Depending on the panel you get...it might not put out enough intensity to burn acclimated citrus leaves anyway. Direct sunlight is > 100KLux. My panel puts out 20KLux with my meter touching the panel. That's a false number because 20KLux all blue is not the same as 20KLux of solar spectrum...it's a bit harsher because blue has the highest energy for visible light.
This is what makes lights so much more awkward than the sun
My "sun-shadow" measures the same lux at the window pane as on the floor several feet away. The sun is so far away that the fall off in intensity over a few feet is functionally zero. My LEDs, however, fall from 20KLux with the meter against the panel to something less than 10KLux at 12" distant. Those numbers are off a bit...the sun is still out and raising the 12" measurement some...but the fall off is dramatic!
Lux meters are pretty cheep these days. You might consider adding one to your light order if you can. The cheap (sub $50) ones won't measure par...but there is a lot to learn from just measuring Lux.
And don't forget you have another knobs to turn: duration...