Todate since January 2009 89 of our 500 LED lights have failed! This is saddening as they cost £6+ each. However spoke to the supplier and we have come to an arrangement. However, overall the concept of LED has been proved. We are sourcing some replacements at £9 per light, which give out 50watt of light for 2.5watts of power. Not all things work first time, but prove the concept and people quickly get on board. LED lights SHOULD last around 50K hours where as a fluorescent lasts around 5K hours. The replacement lights have had a 100 success (non failure) rate, so hopefully we can resolve this shortly.