Hey Gabawi,
Yeah I am with Blue, Not by much. My first Auto grow I had three under one 150 watt HPS. One of them was about three foot high, but lots of stretch, the other two wer about 1 1/2 feet. I got fifty one grams out of all three. Since then I have had smaller ones and ones that came out like the awesome ones you see other's grow.
Here is a good way to think of things. Bury your seed deep enough to get a good foothold and a good stalk growin' about a half inch deep. you can always add a bit of soil if they start to stretch too much. Let them stretch but not too much for the first week, then start lowering the light. I have noticed with auto's if you keep them small at first, they resist the temptation to grow tall with a short internode distance, which will compound the size of the buds. Once they get in the habit of growing furiously towards the light, the usually stay in "grow mode" Using a fan helps with the vigorous growth pattern by strengthening the stalk, helping it to absorb as much nutrients as possible.
I believe it is these first few weeks of growth that will determine how well they do the rest of the grow.
My own opinion
:Sharing One:
Peace
Eek