tHello im back in the hobby after a 10 year break. Ive got a 4' hamilton @x250watt hqi with 2 110watt VHO(T12) . so my question is about rewiring this hood, ive removed the T12 and have a 4 light T5 that will go into the fixture. The old T12 had 2 green ground wires and a yellow wire wire nut tied together Do i still need that yellow wire or can i cap it off?