This is a mains operated unit using LED bulbs specifically designed for photographers and videographers with a CRI of 90 and a colour temperature of 5500k. The bulbs are ES or E27 screw fit and have a small cooling fan. ▶ Check out my gear on Kit: https://kit.co/micso36 You can follow us Twitter: https://twitter.com/smickcouk Facebook: https://www.facebook.com/smick.co.uk Google +: google.com/+SmickCoUk Website: www.smick.co.uk