Poor visability VASI lights in Australia

I have noticed while flying the Sim in the US that the VASI lights are very clear and easy to see. And they work as they should - all red for too low, all white for too high and a combination of the 2 for just right! :)BUT - flying around Australia , the VASI lights are terrible. Very dim and difficult to see - they also don't work correctly . They go from 4 reasonably bright red lights for too low to 4 very dim white lights for too high - and nothing in between!! Any other Aussie simmers notice this - and how to fix it??Barry