Cut out:205MM; Efficiency:100lm/W; With fantastic clip fins construction,more cooling area to guarantee better heat dispation; Small size and high power,Maximum power 50W ; Hight lumen output powered by high performance LED, with consistent color temperature; Replace 2x26W,1x26W,2x18W,1x32W,2x32W CFL downlight; Complete kit with triac dimmable or 1-10V or DALI system dimmable driver; Impressive 50,000 hours system lifetime,3 years warranty.