This is an Osram Dulux L Constant 40w/840. The lamp has an average life of around 20,000 hours (if used with QUICKTRONIC) and main areas of application include street and city lighting, application with special thermal requirements, narrow luminiares with high temperatures and outdoor use in suitable luminaires. The lamp is very economical, provides a good quality of light and has a long service life. Dimmable = 1-100% Dimensions are as follows: Overall length 533.0 mm Length 533.0 mm