thnx alexei was thinking exactly but didnt know average optimal equity of a particular hand vs range. i wanna add some strange hands in every range for deception thats why i asked. maybe 36-40% would be fine or less is possible?
If you have no reads on Villain's postflop play you should use a
bluffing range that's game theory optimal, which means a range where your
bluff range is equal to the
pot odds you're laying Villain to call. So if you're laying 2:1 to call, you should be bluffing 33% of the time. If you're laying 1.5:1 to call, you should be bluffing 40% of the time (note: the bigger your bet the less EV it is for you, so try to make it as small as you can make Villain fold with; that'd usually be 3x bet).
You should adjust this for position (you will usually realize far more than 100% of your equity IP and far less than 100% OOP), skill level (if villain is better than you he'll realize more of his equity vs you and your range needs to be tighter to compensate), your handreading skills (if your read of Villain's range is wrong you'll make mistaken value bets more often thus should be bluffing less to compensate), and his range breadth (the wider villain is raising the more hands are on top of his range, thus the less you should be -- or really need to be -- bluffing).