Fiber optic head band: state-of-art multiple coated systems concentrates and focuses the brightest white light available-virtually shadow free. Unique design enables headlight adjustment from side to side and from straight down and upward positions. Coaxial fiber optic headlight is available with a variable 50mm light spot. Convenient focusing sleeves for uniform quality illumination. Absolutely no heat through distance lamp source. Glamorous adjustable plastic head-band with lock. Variable light intensity of high intense source. Halogen light source (double port): Variable light intensity without color temperature change. Special, long-life halogen bulb with reflector. Brilliant halogen illumination 15v-150w Brightness: more than 50, 000 lux Basically made to suit storz instruments. Fiber optic cable 4.5mm dia carl storz type adopter 7.5 feet length