I need to choose a value for R1 to get the bulb shining. I was aiming to deliver 2 A current in there.
In the circuit below I am using NPN BJT transistor with beta value of 100 and built-in B-C potential value of 0.7 V.
My approach to figuring the resistance is
However, in simulation, this resistance yields 1.87 A collector current.
P.S: R1 of 200 Ohms would yield 2 A collector current in simulation