The parabolics give a very even distribution of light over a larger area. I've found that they give a better pattern over large plants, as the light is reflected downward at a greater distance from the bulb. Works nicely over large plants, as long as you can keep the reflector a couple of feet over the crop.

Feel like I should do some cool diagram in Paint, but I don't have the chops.

I didn't notice that your hood was cooled- so you like to fly it in pretty close? Doing large plants, I've always found that things worked best if I flew the reflector a little high, to keep the plants from shading each other- but you need headroom.

I have no idea why this is sticky.