I have an outside floodlight with a failed bulb. Removing the bulb to establish properties revealed it to be a 240V/300W 117mm linear halogen. Now going to my friendly electrical spares shop revealed that 300W linear halogens are no longer available (or at least not from them) and they are now 230W Energy efficient bulbs giving the same light output as a 300W Halogen.
Web research finds them here.
Now I can fully understand how fitting a halogen bulb in an old Tungsten GLS case like this
can provide energy savings, but in my case the original bulb was a halogen in the first place.
Can anyone tell me what is the technology in an energy saving linear halogen that allows them to claim the same light output as a "standard" linear halogen but at a lower wattage?