Halogen downlights - you see them in many modern Australian homes but although they're a popular choice due to aesthetics, halogen downlights aren't friendly to the environment and can be dangerous. Remember the insulation fires - many were caused by poor installation around downlights, andstories keep on coming up in the press.
A quality electrician can reduce the impact of halogen downlights on the environment and also reduce the safety issues surrounding them. This article is aimed at electricians but if you're interested in the details of the recommendations then read it before you discuss making changes to your downlights.