These energy-saving lamps of SLV hold not deliver what they promise, neither the 8000 nor the 4000 advertised operating hours promised shifts. You just fall out sooner and are hazardous. If concrete values promotion is carried out, I expect just that these values be achieved, not by early failure, the saved energy costs by purchasing new absurdity. Given the tom-toms to energy-saving lamps these ones are just a nuisance.