Ideal replacements for 100 Watt, 60 Watt and 40W GLS bulbs, this Classic Eco-Halogen GLS bulb range offers up to 30% Energy Saving over the 2000 hrs average bulb life compared to standard Halogen GLS bulbs and they are also dimmable. General Benefits of Eco-Halogens: Saves 30% in energy and electricity costs compared to standard incandescent bulbs Like for like in size Fully Dimmable Instant Start Up 2000 hours average rated life.  Lasts longer compared to standard incandescent bulbs Brilliant sparkling white light with a colour rendering index (CRI) of 100 No mercury or other hazardous materials Security Front Glass