Dave, the wiring should be OK.
The wiring size and design is determined mainly by the size/type of the bulb used.
If you have the normal old 100W driving light bulb and the new ones have the same then just change the lights.
If your in doubt just pop in and I'll have a gander...or repair. At least I can still do that
Cheers then
Scott
PS I'm not a lightforce fan. Cibie (super, duper Oscar's or decent Hella's (like the rally 3000) for me. But I'm old school