LED lights, Theory vs Practice

LED technology is the current favorite for lighting in the future. They use less energy than fluorescent lights and can emit more pleasing light.  They also in theory do not need to be replaced for many years.

I worked at a hardware and furniture store when I was in college and we carried many different LED desk lamps over the years.  That experience showed me that LED light bulbs break all the time and are often very difficult to replace.

Now it is certainly possible that these were cheap lights not on par with the LEDs of today but given the simple construction of the diode, I don’t think it should matter.

I understand why in theory these light would last longer, IE there is no filament to burn out etc.   So are some types just better than others?

led

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CO2 + H2O = energy

This is well written article on converting Carbon Dioxide and water into energy using nanotubes.  The potential of nanotechnology often seems to good to be true and I really hope the promise pans out.

 

http://www.newscientist.com/article/dn16621-sunpowered-device-converts-co2-into-fuel.html?DCMP=OTC-rss&nsref=environment

http://pubs.acs.org/doi/abs/10.1021/nl803258p

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