I just tried it to see what the brightness output was. I normally run lithium phosphate batteries so I don’t know what the long term effects are but I don’t see why it would be a problem since the driver is keeping the output consistent.
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The reason it only says “Backup” is because there was only one version of this when it came out. Later updates that kept the same name added more specific details to differentiate it from previous versions. Such as E1B, EB1, E1B-MV, etc.
Just to add...I recently picked up a Surefire Aviator W/YG and tried it with a 16650 (in a two cell body) and the light output is exactly the same on low and high using the 16650 as it is using a SF123. So I don't see any danger using 3.7v cells since the output is the same so the emitter is not...
Well I tried more batteries and what I discovered is that when the battery starts to run down then the lowest low mode gets much dimmer. When you drop a fresh charged cell in then the lowest low mode is much brighter (but still dimmer than the next level up). Also, I didn’t notice any other...
I just got a (triple 219c 4K) Laulima Ion with an H17fx driver and twice now I’ve lost the lowest brightness level. The first time I went back and reprogrammed it. The next day it happened again and the lowest level is no longer available. Like the driver voltage isn’t high enough. I will say...