The VLS-55 is a 4-LED light source that enables multi-spectrum and multi-mode imaging and offers a boosted image performance and extended life span without the need for bulb replacement for a long time. Its versatility not only allows a superior brightness under the White Light mode, but also an uncompromised illumination under chromoendoscopy modes SFI1 and VIST2, where the vascular color contrast and mucosal structure are greatly enhanced.