Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month
good price, decent brightness.
Same issue with all the 502Bs: The pill/reflector don't fill the lamp head, so there's a lot of air between them and the body which is bad for heat conduction. Put on a bit of thermal grease if you think it's a problem.
The CR123's are narrower in body than an 18650, and if you use protected ones this allows them to "buckle" a little inside the body so that the contact between them isn't as good. An easy fix is to wrap a dollar bill or some paper around them before putting them into the body- $1 USD is exactly the right height/thickness to steady them :)
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