Well I was just asking because it might be quicker leveling while making heavy armor/ more rewardable/ you can just go heavy armor because you will find enough good light armor in the game.
That's why I asked it in the first place.
Since all smithing levels at the same rate, its "quickest" to craft iron daggers. Don't do this constantly though, its a bad idea.
Once again though, given that the best light armour can be crafted by going the light or heavy route, but the best weapons can only be gained by going the heavy route, it is technically superior to go the heavy route.
You won't get to upgrade your armour as you level it, but once you get to the top you win.