Thank you for the answers!
Didn't really think spiders do any harm for the plant (plain logic) but asked anyways, better to be safe than sorry!
Today I bought the HPS and MH light as well, so tomorrow will set up my growroom. (O
) I dont like to say bad about people,but fuck the woman in the store was a bitch! She asked if I'm a beginner in growing and I said yes. I told her I only need the light set. She tried to convince me with the worst possible tone in her voice that I need a tent set. I said I have plenty room and will use floor vent and windows/door to keep the temperature under control. She said "ohhh okay so why dont you just go outside and spew your seeds somewhere and just let them grow without touching them". When I asked why tent is so necessary she said "cannabis is a very precious plant". 2 customers were in the store and said that tent is absolutely not necessary in my situation. One would expect that you would meet a friendly stoner clerk in a growshop. lol Told her she is lucky today cause I traveled a lot to buy the set but under different conditions I would never spend a dime here. I guess she was mad that she couldnt convince me to spend 500 $ there, spent 200$ total.