We have been making these 12V 2D light fittings for over 25 years. Using our highly efficient inverter circuit, the light uses approximately 1A on a 12V circuit. The light includes a 16W 2D tube in this fitting. We also make these with a 10W 2D tube, using the Duralamp tube. These lights are for 12V use only (allowing for the fluctuations in voltage on 12V leisure circuits), we also manufacture a 24V version too.