Information that could help prolong the life of your halogen bulbs:
G9 halogen bulbs present in most of my electric aroma lamps and do (like any other bulb) have a good lifespan but will need replacing from time to time. However, touching glass halogen bulbs with bare skin is reported to be a possible cause of bulbs 'blowing' prematurely, or not fulfilling their 'normal' lifespan. It is reported that when the oily residue from fingertips and bare skin comes into contact with the outside of the glass bulb, this can affect the halogen inside the bulb - causing the halogen gas to distribute unevenly inside the bulb and weakening the filament inside. It is therefore recommended that bulbs are handled using papertowels, kitchen roll (or similar) to avoid contact with skin.