Gualala Robotics has a new LightRail Extreme Duty Greenhouse Package that is brilliant for the off season greenhouse. It comes with the perfect greenhouse support attachment and has 13′ (4m) of Rail for a longer greenhouse run. See link at the bottom. The photo above is of an all-season greenhouse in Iceland using winter greenhouse lights. Any indoor grow setup north of a certain latitude will absolutely need winter indoor grow lights. And, that’s because the greenhouse indoor grow system simply does not get enough of an effective natural sunlight supply. The sunlight sourced indoor plant light, through the greenhouse ceiling or walls, is too low on the horizon. Plus, the days are too short for our greenhouse indoor grow room. So, we supplement our indoor greenhouse with grow lights. Those grow lights might make up the majority of our greenhouse lighting and that’s expected. We can grow very effectively year round and that’s by using winter greenhouse lights to their maximum. We can also get a better indoor plant light to more leaves. And, that’s while getting rid of the stationary grow light shadows.