The amazing thing is that one project we have at work involves a whole PCB controlling the lights for a camera. The bulbs get a variable voltage to improve life and help the camera see without flaring, the rig is on an umbilical down a conduit 40 metres away.

Not surprisingly to protect the fusing (mostly) but also help the bulb we have a circuit measuring the voltage and holding off the relays until the voltage is low enough not to cause concern. So if they leave the lights at full voltage they have to wind the variac down to near zero.

Fuses are easy to replace but you really don't want to change them every time you forget - assuming you have one in your pocket at the time.