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The steem power itself doesn't matter, you can vote at whatever percentage you want. It is always 2% of your voting power for you to give a 100% vote of your voting power and your vote goes up 2% every 2.4 hours. Now if you have a lot of steem power and you vote with only 20% voting power it can still be worth a lot. And if you got to 0% voting power, you will be back to 100% in 5 days if you don't vote. Hope that helps.

..for you to give a 100% vote of your voting power..

It's these 100% that I am referring to. I would like to be able to vote content with 50% to ensure my voting power doesn't drain so fast. How do other users do that, is there a special program required for that ?!

Here's a screenshot from my Steemworld profile: