cold light source: TypeHLS-2100PHLS-2200PLamp150W Halogen Lamp Construction with double lampsColortemperature3200K4200KPumpdurable and quiet pumpAdjust pump to high or low according to needs, durable ,quiet TypeSLS-2100PLamp21W Xenon LampColortemperature5900KPumpBoth durable and quiet pump XLS-180P: Lamp: 180W Xenon Color temperature: 6000K pump: Both durable and quiet pump LLS-2100P: LED LIGHT SOURCE Key Features and Benefits Color temperature: 6000K Long life LED lamp: 50000hours Exceeds the brightness levels of 150-watt halogen-based fiber illuminator technology 50% more energy-efficient than halogen-based technology Consistent color temperature during dimming and over time Does not emit light in UV or IR Output: 390 lumens Input power: 40W