The regulations regarding the use of fog lights in Qld. is quite clear. Have a search for fog lights in the Transport Operations Road User Manual in www.legislation.qld.gov.au
Not to be used other than in conditions of poor visibility, not to be used in conjunction with headlights, must be wired through and used in conjunction with side lights.
Sorry, Disco44, there is no restriction on wattage. However really bright ones would be a negative owing to the amount of light being scattered by droplets of moisture in fog. My Perlux 200T's from the USA are 100 watts.
The yellow lens is a French affectation. Fog lights in Oz are not required to be yellow.
If you are really bothered by bright lights following and want to get the message across, fit Unity aimable spotlights. These can be moved and directed from the driver's seat and put right in the eyes of the following driver. See UNITY HAS THE RIGHT LIGHT

