Phillips Industries has increased the brightness of its PERMALITE XB interior trailer dome lamp by 30%. Available for new trailers and for retrofit on existing trailers, according to the company, the new PERMALITE XB with a 1600 lumen output is brighter than many interior LED lamps. The improved illumination produces a 175-degree light spread. The PERMALITE XB dome lamp is encased in a low profile polycarbonate housing to prevent damage.