For Siros L 400/800 Monolights_400/800ws_replacement 400-800 w/s flashtube_The user-replaceable Broncolor Flash Tube for Siros L 400 and 800 is a spare or replacement for the one that comes with Siros L 400 or 800 monolights._Specifications Weight: 0.2lb / 0.09kg Product Height (in): 2.48 Product Length (in): 7.24 Product Width (in): 3.54 Product Height (cm): 10.1 Product Length (cm): 18.4 Product Width (cm): 9