DMX512 Remote controlled LED
Be sure to terminate RS485 at both ends. 54 to 100 ohm range.


To switch LEDs on, Choose the number of LEDs by forward voltage at rated current to add up like zener diodes and allow ~1V for current limiting resistor for fixed regulator (use 2V drop, if using battery, say 13V with +/-1V tolerance. 

Vf of LED depends on colour and current.
LEDs must have a good heatsink.
You can choose any transistor that has enough current gain from logic level to LED.

Choose MOSFET or BJTs (Darlingtons is more current gain needed as single stage BJT gain is only 10~30x typ saturated.)

Alternatively use constant current sink which regulates well but less efficient than &lt;1V Rs current limiter.

Typ >2V drop min. on MOSFET) If= 0.7/Rs


If fixed regulator, I would go with &lt;1V drop power resistor for each string.

For more info on LEDs see my other links.
&quot;low current&quot;, &quot;high efficiency&quot;, &quot;high intensity&quot; LED&#39;s

LED current limiting resistor and Ohm&#39;s Law