LED Ultra Flexible Linear Lighting System. The advantages of energy savings, low voltage operation,and low heat generation, makes Starfire Lighting’s Xen-Flexible Flexible Lighting System, outfitted with Xenf ex LED lamps, an excellent option to meet today’s Green building requirements. Xen-Flexible LED contours, curves, and angles on any plane. Xen-Flexible LED is dimmable with the use of a compatible low voltage magnetic dimmer. A complete line of 24 volt magnetic transformersis available.