I even got this email from tech support earlier this year...
We are currently updating our website to correct some discrepancy's. The correct runtime for the L1 is 4.5 hours of full brightness, followed by a moderate output of light for another 4 hours , with a usable light of 30+ hours. The low output beam has a runtime of 50 hours. Usable light is described as a level of output sufficient to illuminate an object, such as a keyhole, from a distance of several inches in total darkness. Thank you for supporting Surefire. If you have any further questions or comments do not hesitate to write, email, or call us. We are dedicated to providing world-class customer service and welcome future inquiries or comments.
We are currently updating our website to correct some discrepancy's. The correct runtime for the L1 is 4.5 hours of full brightness, followed by a moderate output of light for another 4 hours , with a usable light of 30+ hours. The low output beam has a runtime of 50 hours. Usable light is described as a level of output sufficient to illuminate an object, such as a keyhole, from a distance of several inches in total darkness. Thank you for supporting Surefire. If you have any further questions or comments do not hesitate to write, email, or call us. We are dedicated to providing world-class customer service and welcome future inquiries or comments.