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Why does my HM65R or HM65R-T drop down in lumens during use?Updated 4 months ago

HM65R is an outdoor trail running headlamp. It has designed a forced brightness reduction function in high output levels to ensure that the power will not be quickly consumed and has a longer runtime to deal with the uncertainties of long-distance trail running. The headlamp uses a segmented constant current circuit that matches brightness and runtime on the basis of battery power. When the brightness of the product is reduced to provide a longer runtime and a certain output level for illumination, a constant output is maintained until the battery power fails to support.

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