Treat Heavy Armor as Light?

[PrinceAngore]

I know Im old school and don't know much about 3-4 ed but back when I played one of the armor enchantments was "Weightless" which cut the weight down significantly add in Armor proficiency and pretty much everything was "light" armor..
Or there was an item called "Armor of the Heroes" I believe, that was plate mail and weighed 5 lbs...