How high do I hang my light from the canopy? I’m using the mars hydro sp250 Sent from my iPhone using Grasscity Forum
You really need to learn how to read light stress. And a $12 watt meter is very helpful. Also the $30 Dr Lux meter. Usually max par and decent coverage is at 18 inches. But max par and optimum distance can fry a plant to a crisp. You will not go wrong starting no closer than 24 inches, but be ready to increase all the way to 36 if you have room and your plants leaves start to curl, or go light green, or start getting a suntan. The lux is kind of a crazy number, with growers running all the way down to below 30,000 to 70,000 lux. The lux meter is nice, because if you get a bud that looks perfect, you can take a reading on just that bud and then adjust, either by tying, or moving to that level for more buds.