yeah it's some bagseed , i started growing it under some CFLs with three others and it outgrew all the others and eventually led to their death by over shading them (Aerogarden setup)
Oh and to make it more efficient, invest in some mylar (or i think thats what its called...the reflective materila u cna line the walls with...DO NOT use tin foil, I made that mistake....Thank god the good folks on this site helped me out before i killed my plants or anything).
GroWell > Diamond Reflective Sheeting
Thats the best reflective material availble its £4.25 a metre but if your doing a small grow it perfect. if not they sell mylar at £2.50 a metre