How much light do you need?

http://www.instructables.com/id/Tin-Can-Lamp/

3W LED home made Lamp or 100W incandescent?

Cases Considered

Results from Osram

The Bigger Picture

How do we use new efficient Lighting technology?

New York Times

Article in The Economist August 2010 “Energy conservation, Not such a bright Idea” Efficient lighting Leads to More energy use Not less!

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Historical Efficiency

Efficiency ≠Conservation

More efficiency usually means an increase in the services provided!