Both 100w bulbs will draw 15 amps (200watts/13.5volts). Check that your
head lights fuse and wiring can handle this amperage.

Wiring may be marginal. I have heard that some wiring/switches, relays have
in fact been damaged due to the high current flow.
If you do make this change make sure the lights are adjusted correctly and
you do not blind oncoming traffic. (my major gripe with jerks that run
around town with superbright headlights and offroad lighting systems)
The life you save may be your own.
Peter

If you're at all in doubt of the ability of the factory wiring to
handle the load, I'd suggest you run heavy-gauge fused wires directly
to the battery for the headlamps, as well as separate heavy ground
wires.  Connect the original headlamp wiring to a relay to control the
power from your new wires to the headlamps.  This way, the factory
wiring only has to handle the tiny current required to turn the relay
on and off, while the heavier wires you install will handle the
current for the headlamps themselves.  A typical Bosch SPST or SPDT
relay is designed to handle 30 or 40 amps of current, so
higher-wattage headlamps will be no problem for them.

As an added benefit, your headlamps will be receiving full battery
voltage, whereas the factory headlamp wiring usually has some losses
in it.