Your Browser is OutdatedQ&A for SureFire X400 TURBO Series High-Candela LED Weaponlight — 1 Questions & 2 Answers
The Turbo is a high candela light, which means it has a narrow but very long beam throw. The the light can throw decent illumination over distance. The Ultra is a high lumen light, which means it illuminates a large area but the light does not have a long beam throw. The difference is about what distances you intend to use the light. For long distances up to 100 yards, use the Turbo; but if your goal is brightly illuminating only 15 to 25 yards, the Ultra will serve better.