like it is in the drawing of sebi now: if the output from the ICL is high there is no current.
"IF" you want it otherwise, Q1 must be another type of transistor: Also
een NPN
How it works: A small current goes from the base to the emittor in Q1, this allows the Transistor to open a path for a higher current from the emittor to the collector. The emittor current from Q1 is the base current from Q2 which its turn amplifies the current, and supply a sufficient current for the bulb from emittor to collector.
The bulb itself limits the current.
The value of the resistors depends on the choosen transistors.
The one between ICL an Q1 can be higher.
For this drawing: ICL = 0 bulb is off, ICL=1 bulb is ON