Pwm = pulse with modulation.
Basically the led is turned on and off hundreds or thousands of times a second to give a lower output than max, low pwm (200 on offs a second or less) can give a flicker that is noticable to some people, personally I only even notice it looking at a running engines pulleys or a fan, some people find it nauseating.
When you say regulation, most lights are regulated, no regulation = direct drive, no modes, I think what you mean is you want something like a mag light Ivan which will continue to run till the cells are dead.
That’s difficult, here it might not be a case of a light that fits as a user that fits ie, check your cells every once in a while and keep spares (both lights and cells) available. This will sound like more expense, basically because it is, but maybe look at a 3/4aa light for the house, a collection of eneloops and lithium primaries and a single AA/aaa everyday carry light. That way, you always have a light, to make it easier to change cells in your light… :bigsmile:
So, light suggestions, thrunite have been doing some deals, I got a t10(single AA) and ti (single AAA) in a deal as a Christmas present for my mum, these are real good edc lights, small good output, two mode.
Then maybe something like this
http://www.intl-outdoor.com/cyclone-c88-xml-u2-910lm-flashlight-p-349.html
Pardon the joke looking name - cyclone… The caveat is, you won’t get its maximum output from eneloops or primaries, it needs a proper lithium 26650 cell to give the current it needs, but it will give you light on available cells in an emergency.
A similar proposition is this
Although this gives more light on 4aaa that one lithium….
It’s pretty robust, I keep it in my glove box as an emergency light, loaded with a 26650 and with some rechargables in the 4aaa holder and a pack of lithium primaries in there. I really don’t see me being stuck that long, but better safe than sorry.
There is also the well thought of jetbeam pa20/40? I think, along with other manufacturers comparable lights, the new Maglite AA light is also considered worthy of thought.
Ultrafire/Aurora also does a 3aa from deal extreme but I’m struggling to find a link.
Hope all this waffle helps. :bigsmile: