One of the key components of a flashlight is the driver, which is the electronics between the battery and the LED. The primary function of the driver is to regulate the voltage going to the LED. So if you have a 1.5V battery, the driver will increase the voltage to the 3.6V or so that a LED needs. If there are 2 3V batteries, a driver is needed that will reduce the voltage from 6V so that they won’t blow out the LED. But drivers can also give different light levels or provide strobe and SOS modes.
Not long ago I bought a flashlight that uses P60 drop-ins. The advantage to that kind of light is it uses a bunch of standardized parts that can be swapped out. So of course I was on the lookout for some kind of modification (or “mod”) I could do to the light. It is a good light, but comes with 5 modes by default (High, Medium, Low, Strobe, SOS) and always comes on in High. Really I would rather have a 2-mode or 3-mode light that would remember what mode it was in last. If you want Low, it stays in Low until you change it. Well, obviously all I would need to do is find a new driver.
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