Pictured above is the miserable corpse of a low energy, planet saving light bulb. We have a light fitting which takes three of them and in the past four years all three have failed. They failed after roughly two, three and four years so that works out at an average life of about three years for bulbs which are supposed to last ten.
Soon, as well as light bulbs which don't work as advertised we'll have green electricity which doesn't work as advertised either. Maybe the bulbs will last longer without electricity, but I wouldn't bet on it.