Aputure AL-528S Amaran 528 Bulb Spot Light (Black) 528 bulb Daylight Temperature off Camera Spot Light; 5000 Lumens of Spotted Lighting, Color Temperature: 5500k Step less Brightness Control; Rotate the brightness wheel to adjust brightness output, LCD displays from 10% to 99% PWM Technology for Low Power Consumption, and High efficiency Energy Saving Bulbs Double Power Supply; AC adapter or Lithium Batteries Use Amaran 528S to get the same Professional Lighting seen on TV and in Hollywood