This review gives some details on the 3x21d’s performance: [Review] Convoy new release 3x21D SBT90.2 thrower flashlight.
Based on this the output does decrease over time, but it seems to provide a lot of useable light over time.
This review gives some details on the 3x21d’s performance: [Review] Convoy new release 3x21D SBT90.2 thrower flashlight.
Based on this the output does decrease over time, but it seems to provide a lot of useable light over time.