Wow, you guys are generous! Pulling a pound from a single 600w isn't easy. Especially if your environment and techniques aren't dialed and especially if this is a first grow.
Dont' want to rain on your parade but it you pull .5g/watt this first go you should count that as a win! Very few people are pulling a pound with a single 600w in a closet. I'm not saying it can't be done, but very unlikey unless you are using some type of training technique(maybe scrog/vertical) and everything is dialed in=your environment, your nutrients, etc.
.5g/watt is 300. 300/28 is slightly over 10 oz. That's more then an half pound coming from your closet! Not to shaby.
If this is your first go then you should be happy if you even reach harvest! And if you do, thank the gods! If you search these forums you will find it takes a lot of people multiple tries, mistakes, and disasters before they finally get their first harvest.
To be a succesful grower I believe you need 2 qualities. Patience and the ability to learn from your mistakes. I would suggest not counting your eggs before they hatch. Have fun, watch your babies grow, and enjoy the process.