Green LongLife 3528101 LED 18&rdquo; Replacement Light Tube with T8 base 500 Lumens 12v or 24v Natural White 100,000 hours life expectancy; turn to adjust directional beam of light 8-30 volts DC including 12v and 24v; the wide-range voltage is designed to withstand RV power fluctuations LED Replacement Tube for 18 light tubes with T8 base Low heat, energy efficient, eco-friendly, and instantly bright Comes with easy-to-install instructions