Picture of some LEDs
Occasionally, something in the world moves on: progress is made: and today is such a day. And on this day I just want to pause to celebrate the progress that humanity has made through its collective appreciation of metrology.
I will leave the details to the NPL web site, but today we moved to new paradigm for specifying lighting. In the UK, light bulbs must now be labelled according to how much light they produce – how many lumens they emit – whereas previously they were labelled according to how much electrical power they consumed. This change reflects the reality there are now many different technologies which produce different numbers of lumens per watt. This change is critical to driving people towards more efficient lighting technologies. As I mentioned last week, this won’t save the world, but it will at a least save a little energy.
Protons for Breakfast 
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