It is hard to harvest solar energy in overcast conditions, so it is prudent then to reduce consumption. One of the best ways to do this is to avoid energy being lost to heat. A prime example of this is the halogen light bulb, which gets so hot it creates light.
LED light bulbs do not get hot and are therefore very efficient, giving bright light with low energy consumption.
Below are a range of low energy lighting solutions, that use SMD LED technology.