Runtime test of Acebeam K1 UV lamp w/ 14500

LED Flashlights – General Info 1 x AA / 1 x 14500 Flashlights
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To test this, I used a glow-in-the-dark diffuser since otherwise the ceilingbounce app would have nothing to measure. This might cause some smoothing of the graph since the material will not change brightness quite as quickly. But it’s a cheap’ish material and stops glowing brightly pretty quickly. More problematic is that the highest output only registered about 8 lux. So I think the sensor only has a limited set of discrete values to choose from, and this resulted in a kind of sawtooth pattern. I don’t think recording low outputs like this will be as accurate, but it’s something.

I mainly did this because there’s already a bunch of regular reviews of this light, and plenty of people have measured the white-light runtime.

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I wasn’t watching the light when it hit 0 around the 200 minute mark. I don’t know if it was still on or maybe the battery protection cuts in but later as the cell recovers allows it to turn back on? It had already recovered when I checked on it, but I turned it off the next time it hit 0 rather than see if it would repeat the pattern. The cell measured around 2.9v after the test.

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I recall a while ago, user DJozz used the fluorescence of uranium glass to “convert” UV to something measurable.

The chart you provide is nice, I don’t often see runtimes of auxillary modes/emitters, thanks!

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There’s always people testing the normal stuff, especially on new lights from mainstream brands. So I tend to test more oddball stuff. :smiley:

I was surprised it dropped in output so quickly. It doesn’t get hot when using the UV on high. Maybe it’s a timer and could be reset if you really needed a lot of UV for several minutes. I was a bit concerned I’d be stuck testing it for like 12 hours or something if the output was really low.

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Absolutely guessing, but I’d suspect it’s the same issue as many UV lights- the emitters have high Vf so the driver drops out of “regulation” and output is directly related to cell voltage.

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