Includes field replaceable 12 watt, 740 delivered lumen, 27000K, 3000K or 3500K field replaceable LED module. Dimmable with low-voltage electronic or magnetic dimmer (based on the transformer). Choice of 20° or 35° field changeable optics. Integrated lens holder accommodates up to two MR16 sized lenses or louvers (sold separately). As a general rule when using the Burk head, we do not recommend using greater than 33% of the maximum wattage specified for the low voltage transformer due to inrush current requirements. For assistance in calculations, please contact Technical Support.