Lopez netted from the penalty spot deep into injury-time to make it 1-1 and cancel out Jordan Rhodes' 45th-minute opener for Rovers.
It was Brighton's 12th draw from 28 Championship games this season and Poyet said: "I need to make sure that we don't keep drawing and drawing because it's too many.
"Do you know how many games we've lost this year? From 28 we've played we've lost six and we are not in the top six.
"How? Because we draw too many. It's better from now on that we win one and lose one."
Poyet reserved praise for goalkeeper Tomasz Kuszczak, who bounced back from a weekend howler that handed Birmingham a point with a fine display at Ewood Park.
"I learned a lot from Tomasz because he didn't make one mistake the whole season and then there's his mistake at the end against Birmingham," he added.
"To see his reaction - he was he was very good, he kept us in the game and because of that we were able to get a point. Concede two or three and the game is over.
"Credit to him, I'm happy that the reaction was the one I needed and the one that he wanted, of course."