Lighting: Why (not) halogen lamps?

Halogen lamps provide feel-good light that looks and acts like natural light. They are fully dimmable so you can choose either bright light or cosy light to suit your mood. These lamps can be environment-friendly and comes with energy-saver versions.. More info from Osram

Some sources though points that Halogen lights consume relatively more energy. Check the BCA green-mark portal for more info on GreenBuilding tips..