STEDI ST-X 40.5 Inch E-Mark LED Light BarDESCRIPTION ELECTRIFYING PERFORMANCE. At the core of the ST X 40. 5 Inch, you will find world class A grade 15W reverse facing emitters pushing out 8400 Lumens at a stunning 5000K colour temperature. The 30 degree horizontal beam pattern facilitates maximum illumination at the mid to long range, all the way out to 1 lux @ 859m, with very little light within the first 80m. The 15 degree vertical spread means minimal light wasted and significantly