4.2W - 108 LED diodes 4-1 (Red Light: 630 nm, Blue Light: 450 nm, Yellow Light: 580 nm, Infrared Light: 830nm) . 38mw/cm2 max output. modes - Red Light Mode - Blue Light Mode - Yellow Light Mode - Purple Light Mode (red + blue) - infrared Light Mode - Red and Infrared Light Mode Irradiance output power: through silicon Red and Blue at 0 inches: 16.2 mW/cm² Blue only at 0 inches: 13.4 mW/cm² Yellow at 0 inches: 7.5 mW/cm² Infrared at 0 inches: 20.3 mW/cm²