Hi guys!

I wish I could go to the gym and lift weights, but that's not an option right now. I'm searching for ways to lift at home and maximizing my results. I use a DVD and the lady does a very good job covering upper and lower body. Perhaps it won't equal what I might get at the gym, but you do what you gotta do with what you got.
I use 3-lb, 5-lb and 8-lb dumbells for upper body. No "extra" weight for lower body (I do things like squats, lunges, etc). Can I work out this way and still get good results? What counts as "heavy lifting" anyway? I hope I don't have to be lifting 100s of lbs and screaming for that to count as heavy lifting...
Any ideas? Any advice?
Thanks!