In conclusion

LED application for colored signalling are expanding given the reduction in the price of semi-conductors and the improvement in light output.
For general lighting applications, a lot of progress still needs to be made but it seems reasonable to think that the use of LEDs will increase in the next 15 years and reduce the market share of incandescent light sources or even that fluorescent light sources.
Ever since Edison’s discovery, no innovation has been able to eclipse the energy guxxling yet inexpensive incandescent lamp. Can the LED achieve this?
LEDs offer a big electrical energy savings potential. Lighting is responsible for 20% of global energy consumption, and 15% of illumination is still generated by incandescent sources with an output of 11 to 18lm/W. OIDA estimates that with an output of 200lm/W, LEDs will be anle to reduce the consumption of electricity for lighting by half.
Belgium energy consumption is around 85000 GWh that is 17000 GWh(15) just for lighting with everything else being equal. By substituting the LEDs for incandescent sources, we can hope to save 8500 GWh on our lighting, which is nearly the production of a reactor at the Tihange station……