Help with custom motorbike tail lights
To wire ~30 LEDs at 12V (bike voltage) use the following wiring diagram:



You will need resistors to limit the current. Using the resistor value of 100 ohm will limit the current to ~15mA (chosen arbitrarily as you don't know how much current your LEDs will need) per LED (@ 5 LEDs in series).

The brightness of LED is dependent on the current flowing through it therefore you would have to experiment with the amount of current as you don't have the DATA on the LEDs. To increase the amount of current through a LED you would have to decrease the series resistor.