You haven't defined "an LED array".
Can it be assumed that some form of current limiting (resistors) is included?
If so, you'd use the circuit on the right (common emitter).
A TIP29 is a power transistor, it does not have a lot of gain.
Without knowing what kind of current this "LED array" requires, it may be that you cannot get enough base current to get that thing going.
For "R1", in the circuit on the right, use 100?.