With a modeling light of 250 W & a maximum flash output of 4800 Ws, the Acute/D4 Head is the top of the line lamp head for all Acute generators, as well as the Profoto D4. When using this head on the Acute B 600 there is a special adapter allowing you to use the high-performance 65 W lamp. Zoom Reflector Quartz flash tube 250 W / 500 W halogen lamp Removable frosted glass cover Protective transportation cap 5 m (16 ft) lamp cable