I have some experience with emsiar DW4. This light has lumex1 boost and maximum tailcap amps should be ~12A. When I first got the light, I did not have high quality flat tops available so I used a salvaged sinowatt cell from a mobile battery pack.
When using the salvaged cell, I could get pretty good turbo from the light but it would really fast step down without getting hot enough for the thermal protection to kick in. Extra amps also made the cells voltage sag badly. This was kicking the high modes out of regulation - I think. Directly after turboing the light, the lamp would show really low voltage readings (<2.5V) from which the cell would recover in less than a minute.
I bought a high drain Molicel P30B cell to get all out of the light. With that cell the light will warm up fast, and the thermal ceiling is the only thing that keeps heat at check.
Iād recommend buing a quality cell for high power light. The light should have own thermal contol. If it does not, you can always run lower output to keep the light cool.
I had some problems finding the 50PL in the US. I found these today and bought 4 of them:
They are still advertising them as 125 amp cells. Not sure if they are pre-production or not. @thefreeman Have you seen a data sheet on the production cells showing the 50 amp rating? I have looked, but came up empty.
Mooch said in his latest Patreon post that the datasheet version B/C only lists a 50A max continuous current rating. the 125A temp-limited and 180A pulse ratings were in version A.
he didnāt link to the datasheet.
Well, itās not like they invented it, but yeah itās not up to date.
Also I want to point out that Tenpower 50XG and Reliance RS50 have basically the same performances, so if they are easier to source/cheaper, these are great options as well.
edit : oh right I see theyāre not saying itās temp limited, so yes, bad information regardless of datasheet version.
Is there a reliable way of modifying existing drivers to output a slightly higher voltage, to offset voltage drop caused by longer leads to the mcpbc that would likely occur? I havenāt done testing, but after a foot or more Iād assume that output voltage will suffer a significant drop.
I assume once one figured the schematics it would be a matter of desoldering and swapping in a different resistor(s)?
I was searching the forum for content on linear lighting (led tape), and there doesnāt seem to be much coverage of the topic.
Iām no guru, but I have a decent bit of experience with it and with wled, and I think that itās up this communityās alley.
Where should I go abouts posting a wled/linear lighting thread? It seems like none of the categories/sub-categories are really suitable.
Unless this is intentional, and folks prefer having this forum solely focused on portable handheld lighting (?)
A runtime test done exactly the same for all three batteries. Same light same increments same rest time etc etc.
The 50s, the 50pl and the BAK 45d.
At about 1 minute 30 seconds of the first 2 minute increment both BAK cells lost a significant amount of output. The light, L21B secret LEDā¦ turns on at 6,000 lumens. So after that amount of time itās got to be 5,000 lumens. And my guess is it dropped at least 2,000 lumens. The 50s and the 50pl did not do that. The only thing I can think of is a drastic loss of amps and itās supposed to be able to push at least 35 amps.
Strangely enough it seemed to do okay for the rest of the test. But the first two minutes is what drains the battery the most no matter what flashlight or battery Iām using.
All the batteries are new. Iām recycling one of the BAKās and I demoted the other one to a light I donāt use that much!
What prompted me to do this I noticed it when I would use it outside. Iām thinking why is this light losing so much output when I just turn it on a minute and a half ago?
My first guess would be that it is over-specād, but Mooch has tested the 45D and everything looks good. Although I noticed he lists it at 30/60A and 18650batterystore says 60/80A which is quite a difference.
Possibly it has higher internal resistance than it is supposed to? Do you have a way of testing that? Sounds just like bad voltage sag or something.
In the ānew and unread topicsā part at the bottom, is there any way to flag particular threads as āidgafā so I donāt see that same thread listedā¦ Everyā¦ Singleā¦ Time?
Like I click on āamazing temu lights!!ā just for the lulz, poke through, have zero interest in anymore, yet every damned time itās there as one of those listed threads.
