Lost Again

... to blow up a bike?

Not the start of a bad joke but a serious question here.
I've been reading PD's recent thread on making a headlight and decided its the way I have to go.
My question is thus, if I run 5 55W bulbs will it melt me bike. I'll be running a direct feed from the battery via a couple of relays but am worried about frying my regulator and/or alternator and maybe even the battery. By my gusses all 5 running at once would be drawing 22.9A.
Any ideas if the stock electrics will cope?
The other option is to run either 2 or 3 lights at a time for low/high beam drawing a more modest 13.75A with 3 bulbs, but still a breif spike to the 22.9A if I hit the flash switch.

Anybody got any ideas?

Thanks