A single 18650 battery driving 1400lm would be lucky to last half an hour. And I imagine it will trip down on heat or low voltage pretty soon in a small headset.My lamp uses four 18650’s and can’t run for too long at 1400lm without running it under a tap or something. And it has a significantly bigger heatsink. It’s meant for lighting up chambers and photography, not normal caving. Luxury is running at half that - even for crusties like us.You can’t charge it in two hours with a 2A bulk current charger. The thing will limit at 4.2V (or you would sincerely hope so), so it will take 3-4 hours depending on the cut-off current. Nor would I want to charge it any faster. None of this is device specific. It sounds to me it is working fine, but not to your expectations. It is a decent bit of kit for the price. You can spend an awful lot more.
The graph on Fenix's website would do well in the FT's "Axes of Evil" series - neither scale really makes any sense at all. I don't know how they managed to get the 10LM[sic] tick mark on the inside of the y-axis and all the others on the outside; was the graph made in MS Paint?
I understand from the chart on Fenix web site hm65R-runtime-600x180.png that it runs 4 hours without falling to the below level in 1000 lumens. But users says apposite this.
- the spec there quotes 4 hours on the turbo 1000 lumens spot setting,
Hmm - can you believe what manufacturers claim for their products?
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