Osram dulux te constant 42 w840 4050300425566 this is the osram dulux te constant 42 w840 the average lamp life is 20 000 hours and most often used in street amp city lighting industrial lighting hot luminaires and locations with special thermal requirements the lamp is very economical has a long service life and excellent luminous flux at high and low ambient temperatures the lamp is dimmable on a scales 3100 single ended four pin plug in gx24q base with shorte