The measured current draw at 4.8v input is 26ma.
I would rather ask, why use an incandescent lamp at $2.73 a pop, marked down from $3.25? High brightness white leds are cheaper then that and have no current inrush problem, and don't burnout like incandescent lamps.
A. I already have one
B. It casts omni directional light
C. It can be PWM'd without flickering.