)As to your bonus question: Yes, but that only applies to standard incandescent type lamps.If you did that with certain quartz/halogen incandescent lamps youd actually decrease the life of the lamp for complex high temperature chemical reasons.-Residential power grid regulates the amount of power going to your house, so you should only see a temporary decrease in brightness as the draw from a new device takes more power........
Your house power supply is wired to put all your appliances in parallel
across the utility voltage which you can consider an "infinite source".
(There's more power available than you can possibly use.)
You will get the same voltage across every device you connect
until you trip the main breaker.
(Note: there will be a very small decrease in the voltage you get due
to resistance in the line, but it will be far too small to easily measure.)
As to your 'bonus question:
Yes, but that only applies to standard incandescent type lamps.
If you did that with certain quartz/halogen incandescent lamps
you'd actually decrease the life of the lamp for complex 'high temperature chemical' reasons.
Residential power grid regulates the amount of power going to your house, so you should only see a temporary decrease in brightness as the draw from a new device takes more power... the lights will then return to "normal".
It depends, you may just have the wires in your house overheat instead. That would be bad.
That said, reduced voltage can have a positive effect on lifespan, yes.
