Orangeman, that's good advice to buy like that. And, I know how it is, especially if you're just getting things together; it's like, I bought my lights on Ebay, and worried about it, but then you get to thinking, man, how many transactions for growing supplies go through that place, or even through this one dealer that I purchased from, and to my way of thinking, although I think you can never be too careful, there just ain't no way all that equipment's gonna' be tracked.
But, to be honest, I do feel better just heading into the big city and buying things from my friendly hydro center; but, you think about that; it's just a small shop that could be under surveillance 24/7, so really, you get to thinking about it, there really ain't no completely safe way to buy everything, except maybe if you just had someone do it for you, and then you still have a link to yourself.
In the end, I don't think anyone gives a rats; there's just too much money made off of the "hobby" to bother anyone with what they're growing or why, and you also have to realize, there are a great number of people out there that do grow all kinds of things hydroponically & under lights too.
Good luck !