I use a 90w ufo led. The maker of my ufo led recommendations these heights:
During veg. stage: 30cm/12 inches to 60 cm/24 inches above the plant canopy. I keep the led about 30cm above the plant.
During flowering stage: 15 cm/6 inches or closer.
I didn't buy much gear, the led was my most expensive cash outlay. As you can see in the photos, I grow 1 plant at a time and just for personal use (and for my wife). The strain has to be a strain that doesn't grow large as I just can't accommodate a large monster, so indicas work best for me (and we prefer indicas anyway). Other than the ufo led, I've bought a cardboard box, mylar sheet, a fan, seeds, soil, nutes and a chain to hang the ufo light from the light socket in my closet so I can adjust the height of the ufo led above the plant canopy. I've been extremely happy with my grows! Patience is what I've learned to be the most important aspect of growing. Best of luck!