The array 4 is a little bigger in footprint than my array 3, but less output I think. 240w vs 275w.
whilst I really love Migro, it is worth checking out all the options so you are comfortable with your decision.
when I was looking for my first light, I looked and considered 20+ brands, models.
with dimming, if you do a search on this site, you will see some suggestions from various members. From what I’ve seen, the view appears to be that dimming is mostly for seedling stage. and that would be dependant upon how strong/powerful your light is, vs what height you hang your light. a lot of ppl don’t use dimmers. I think they are handy to have personally.
The guys here are great. And lots of knowledge. There are a few here that are into spider farmer, amongst many others
I reckon if you find a kit that has everything you need. Maybe ask here what people think of the kit, light brand, model and the price offered. You may find that there are some folks here that could offer solid advice on it, and maybe even around where to buy.
my experience is very limited to the one model of Migro that I have.