The ultimate LED refit light, The Sigma Large PowerLED fixture mounts with either springs or screws. Its special adapter plate & large diameter trim ring permits installation in to a range of existing cut-out holes from 2.56" through 3.65". Sigma is dimmable using vessel's existing 2-wire boat cable & is also compatible with some existing halogen digital dimmers. Sigma is a 2-wire dimmable LED refit light. Stainless steel springs are provided for interior (e.g. headliner-wrapped or paneled ceilings). For secure in to hard ceilings or exterior locations, simply remove the springs & mount with #4 flathead screws. A 10 to 40V AC/DC universal input allows Sigma to be used with 12/24/32 Volts systems & for voltage supplied by magnetic AC transformer as well.Dimmable with existing 2-wire boat cable (DC voltage only)Compatible with Intervolt Switch mode DC dimmerHole (cut-out) size matches popular halogen recessed spots10 to 40V AC/DC input voltage (from battery or magnetic transformer)May be installed with springs or screwsPart of matching family (small, large, surface-mount fixture)LED Color: Warm WhiteTrim Ring Finish: Stainless SteelLens Material: Acrylic PolymerMethod: Screw or Spring MountIP Rating: IP65Electrical Protections: Reverse Polarity, Transients, SpikesBeam Angle: 83 DegreesLifetime Hours: 50000 hr (70% Light Output)Luminous Flux: 197 lumensCertification & Compliance: CE-EMC, RoHS, Class III, F-RatedColor Rendering Index (CRI): 67Trim Ring Dimensions: 4.35" Diameter x 0.34" HeightRecessed Depth: 0.9"Cutout Diameter: 2.56" to 3.42"Correlated Color Temperature (CCT): 2900KDimmer Interface: Optimized Compatibility with Intervolt PWM Halogen DimmerDriver: IntegratedDimmer Compatibility: Intervolt DC Dimmer recommended (not compatible with AC dimming)Dimmer Control Interface: N/O, 1P/1T Momentary Push-ButtonInstall Location: Ceiling, Interior/ExteriorMax Operating Temperature: 130 Deg F