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Originally Posted by Brian Carlton
OK, I had not even bothered to look.
So, one 100W bulb will draw 8.3 amps at 12V.
The fuse will likely survive this. Remember, unless you have a dead short, the fuse will take quite awhile to melt at the rated load. It might take just about forever to melt at 8.3 amps.
Additionally, the draw will probably be closer to 7.4 amps with a properly functioning alternator.
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If you run a high beam at the fuse rating for any length of time, it will age very quickly. Standard engineering procedure is to fuse the circuit with 50% margin. A 100W high beam will draw 7 amps, I would not run it with less than a 10A fuse. Make sure your wiring can withstand it.