[andrewb]

I think you're just reiterating what im saying but missing my point.

You seem to think that because your calculator works better off a certain source then that source must be brighter. Which is incorrect as I have explained many times we only need certain parts of the spectrum for lights to work well. Therefore the energy saving lightbulbs only show the parts we need.


I don't know how to make it any clearer..

A normal lightbulb shows the full visible spectrum from red to purple including all the different shades of all the colours, every single wavelength from 400nm to 700nm. Where as an energy saving one dosn't use every single wavelength, this means it uses less energy but it is NOT less bright. It just simply uses less energy because its not outputting the same amount of wavelengths but its not noticeable to the human eye.

Oh and, the colour of light does matter because different wavelengths = different colours = different amounts of energy..... but in this case it dosn't because we're talking about all visible light and not blues/greens etc individually.