Hi, I'm new to this forum and I see that it has a lot of information that I've been looking for but haven't found everything. I have just built a growbox that is 3'6 x 4 x 6 with a 600 HPS lamp. I've got everything and now thanks to this website, an idea of my very own Carbon Filter, I would like to know if its worth it to buy non-IR detectable shield (polyshield) for an operation that small. I live in California, near san mateo.. I'm not too sure if they even have IR detection since in San Francisco it's so commonly used with all their cannabis clubs and such. Please let me know soon, my seedlings are growing nice 
