Ordering growing equipment in the United States is not illegal. To be frank, so many people order equipment/nutrients to grow something other than cannabis that the government simply can't put forth the effort to track all exisiting orders and investigate them. I wouldn't worry about ordering lights/soil/nutes/hydro stuff, what I would worry about is the seeds (if you want some crunk genetics). I ordered some from cannabis-seeds.co.uk and they are wonderfully discreet. I sent in cash (using a security tinted envelope) and 2 weeks later got 10 Opium beans in a simple manilla envelope with bubble wrap on the inside.