"New users can only upvote and downvote with 100% voting strength.
Once you reach about 500 STEEM Power, you will see a vote slider appear when you vote. You can use the slider to adjust the weight of your vote, between 1% and 100% voting strength. Voting with less than 100% voting weight will use up less voting power, but it will also have less of an influence on the post or comment's rewards."
"New users can only upvote and downvote with 100% voting strength.
Once you reach about 500 STEEM Power, you will see a vote slider appear when you vote. You can use the slider to adjust the weight of your vote, between 1% and 100% voting strength. Voting with less than 100% voting weight will use up less voting power, but it will also have less of an influence on the post or comment's rewards."
That's from FAQ. I am close. :)
Good info, did not know that.