Whelen 900 Series High Intensity 90&deg; Gradient Opti-Scenelight 24 High Intensity Super-LEDs. LED lighting out performs HID, utilizing brighter color temperatures. LED lighting is more reliable, eliminating the high cost of replacing H.I.D. lamps and ballasts. Certified to meet AMD Standard 024 for perimeter illumination. 6500 Lumen output. Supplied 9EFLANGE Chrome trim ring. "Instant On" with no warm up and no high current voltage spikes on start up.