Take EcoPlus high performance halogen lamps with G9 base from Radium!
Actually, they are available in various wattages:

So, save money and up to 20% energy by changing to lower wattages and realise further advantages:

• CO2-savings due to less consumption of electric energy
• 2,000h mean service life
• shockproof due to innovative pinching technology
• brilliant halogen light
• no bulb blackening
• continuously dimmable

These lamps can be found at Ralopin EcoPlus.