ya a 42 watter could be good for the top, but just adding another 20 or 26 watt light would be the same if not better. Your plant is F-ing lanky bra! Is that a Sativa??? If that's an indica it's trying to stretch because there's no light at the bottom. It's like your pulling the sun further and further away, and the plant is trying to reach up to it. Buy a few more reflectors and and even 13 watt bulbs to place down on those lower buds. You'll recoup the extra cash in more bud, and next time your plant wont stretch to the moon and back.