chevrofreak
Flashlight Enthusiast
As you can see, this S3 has a very low voltage LED. It's so low that it is in direct drive for about 16.5 minutes before the cell voltage dropped low enough that it could be regulated.
The High mode test shows that it is being significantly overdriven by an RCR123 cell. For this reason, I can not recommend the use of lithium-ion cells in the S3.
The clip on the S3 is pure genius. The way it attaches, and the ease with which it is removed and reversed is brilliant. This helps make the S3 a great headlamp when clipped to a baseball cap. While the clip on the S1 and S2 is nowhere near as sophisticated, they too serve well as headlamps when attached to a cap.
Of note, the low mode PWM of the S2 is very visible, at least to me. If you are sensitive to PWM, this may be an issue.
The high mode of the S2 also has some sort of flickering, though I do not know if it is PWM. You can see the thickness of the lines on High, which is because my meter was in Fast mode and was able to catch the fluctuations. I can also see a very slight pulsing when I shine the light at a fan. This does not in an way impact the usefulness of the light because it is not visible unless you look very hard for it.
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