* Medium: M1 43 Lm (12 hrs) or M2 24 Lm (23 hrs) * Low: L1 5 Lm (3.7 days) or L2 0.5 Lm (21 days) * Light output are out the front (OTF) values. Runtime tests are done using Panasonic CR123A lithium batteries. Runtimes are usually much shorter with rechargeable RCR123 (16340) batteries, especially with protected 16340s that have higher discharge cut off voltage.