I need to power 100 blue LEDs. now, i need as few resistors as possible on this really, so i though about having them all in parallel and one big resistor, but i dont think that will work as they never work out equal (allways get one dim one) so i thought about groups of 5 in parallel to a resistor. maby 5 in series or 4 in series to a resistor.. what is the best way technically?