Green is so but not disturbing your plants when they sleep is good. Think of them like us!

But..... saying that. I was very interested in setting up an experiement with a red/blue led left on high in the room in the nighttime. As if you look at the moon through a spectographer then at nighttime there is blue, red and purple light prominent. In my mind that light at nighttime, because it is never truly pitch black for 12 hours, has some good to the plants.

Sorry to add that to the mix, just wanted to see what other people thought to that.