Instantaneous show of light why?

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SUMMARY

The phenomenon of instantaneous light when flicking a switch is primarily due to the rapid transmission of electrical energy through wiring, which occurs at approximately half the speed of light. The perceived delay in light appearance is largely attributed to the time required to heat the filament in incandescent bulbs. In contrast, curly fluorescent bulbs exhibit a more noticeable delay due to their different operational mechanisms. Understanding these principles clarifies the common misconception regarding the immediacy of light.

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Does anyone know a clear and absolute explanation of how is it that when you flick the light switch on there is an instantaneous show of light?
 
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It isn't instantaneous, just too fast for you to notice (unless using curly fluorescent bulbs).
The electrical energy travels through the wiring at about half the speed of light, so that doesn't take long. The biggest delay is the time needed to heat the filament in the bulb.
 

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