When I bought my first green light in order to work in the grow room during lights out, it was a cheap one. I never really shut it off, I just liked the convenience of walking in the room and doing whatever. My first two trays weren't flowering, even after weeks, they just kept getting taller without forming any buds. I finally figured out that the green light that the plants 'couldn't see' was bullshit. They saw it just fine. I racked my brain messing with every other variable while it was this stupid ebay light all along. Those trays turned out boo-boo, I learned my lesson. Some stuff just isn't covered in the forums...