Your schematic indicates massive problems (as pointed out by GrumpyMike in reply #12). Fix that first before trying to fix your brightness problem.
And yes, adding series resistors to each-and-every LED will be a lot of work.
Your schematic indicates massive problems (as pointed out by GrumpyMike in reply #12). Fix that first before trying to fix your brightness problem.
And yes, adding series resistors to each-and-every LED will be a lot of work.