I think that one has to be careful with the whole "going green movement" I think that one has to consider sensible saving vs "Fasionable Greening". We changed our lights to CFL and LED long long ago. The motivation for doing so was simply to lower our expendiature on electricity. One could save water by catching rain water and also by using grey water. I think that you have to be practical. It is not practical for me to spend R8k to save a bit of electricity in the hope that the saving will be recovered in 5 years.
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