Full spectrum lighting is fine, but the important number is the wattage. You want about 30-40 watts per square foot of flowering footprint.
If the plants are really stretchy in veg, they’re probably not getting enough light. You will probably want to move it down closer to the canopy.
Hang drying is fine, but the only thing likely to fall off the plant is crappy fan leaves that you dont want anyway. I don’t believe enough trichomes will just fall off your plant to make it worthwhile trying to collect it.