This is an osram vialox nav t 400w super 4y lamp this type of lamp has an exceptionally long life of 32 000 hours on average and can be made dimmable if used with suitable control gears the most common areas of application for the lamp include streets outdoor lighting industrial installation and is suitable for use in open and enclosed luminaires and outdoor application in suitable luminaires the lamp has an e40 cap and is 2000k in colour dimensions amp weight diameter 470 mm le