i got a solution..
what you need is variable voltage transformer (it will output basically 0 to 100 percent of your input of vac power)
the material i used is Variable Autotransformer directly connected from 120 vac and on the output there is a fuse before it connects to hot wire
its very simple and cheap solution but if you are only running one wire in shorter distance this item doesnt control fine adjustment so it might be harder to adjust..
hope this answer helps if someone else is trying to do this..