i think it should be the other way around. you're not trying to protect the
bulb, but the wiring. if the draw of the appliance is higher than the system
was designed for, the safeguard is to have the fuse blow BEFORE the
wiring is damaged. i would never advise increasing the fuse rating but
maintaining it as is....or in extreme instances, go lower (blow earlier).

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-- raymond~
47º 34'N 122º 18'W