If you were to connect straight to the wiring for the front light, then you bypass the switch on the front light. However, if you connect it to the bulb contacts, then you will make use of the switch.
Well TBH you could connect straigh to the live wire, and use the ground contact on the front light. the reason for this is that the light is negatively switched. DOes that explain better, or have i misunderstood your question?