The LRK installs into existing troffers without the need to enter the ceiling space, giving facility managers the quickest, most cost effective means of replacing outdated fluorescent lighting systems with the high efficiency and performance of LEDs. With a profile measuring less than three inches in depth, the LRK is designed to fit standard 2-by-2 and 2-by-4-foot troffers with ease. In most cases, installation of the LRK takes less than 10 minutes.