What kind of lighting is in the WC now.

60 watts probably refers to the energy used by incandescant bulb(s). Incandescants are very inefficient light sources because they generate a lot of heat. The 60 watt limit is related to heat buildup.

Consider switching to either CFL or LED bulbs for some significant energy savings. For example if the fixture is rated for two 60 watt incandescant bulbs you could install two 15 watt equivalent CFL bulbs and get almost twice the light for about half the energy usage.