Dolan-Jenner Fiber-Lite Fiber Optic Illuminator Series has been re-designed to feature an optional iris and 5 times longer lamp life. 150W EKE bulb lifetime is typically 1000-10,000 hours depending on intensity. Dolan-Jenner Fiber-Lite Fiber Optic Illuminator Series features a low-profile top handle and side door for easy lamp changes. Additional features include: on/off rocker switch and intensity control via adjustment knob. Dolan Jenner SX Fiber Optic adapters needed to mate with fiber optic light guides. Replacement Bulb sold separately.