On Fri, 25 Jan 2013 13:59:09 -0500, "=" wrote:

Another choice is the so-called "2X" bulb that a company called ADLT
announced. It gives the same light output as the old 100 watt, but draws
only 50 watts and is rated for 1500 hours. That's an additional choice that
we didn't have before.

What are they? I assume the 72 watt replacements are halogen, but what
makes these work?