The online ramblings of Housebuilder's Bible author Mark Brinkley. The paper version is updated every two years and is widely available via UK bookstores and Amazon
2 Apr 2009
Lumens per watt: a useful graph
Was looking into the background of lighting efficiency when I came across this chart on the web. Useful. BTW, Part L defines energy efficient lighting as anything that equals or betters 40 lumens per watt. Click on the chart to make it open up larger in another window.