Nitecore EA8 tear down - Modding will be later and in a different thread.

[relic38]

@luvlites

I should have said that relative outputs were in throw on that first graph. Here’s the same thing in lux which makes the percentages larger but the overall picture is the same.

I’m using an Extech SDL400 which I set to record every two seconds and which auto-ranges. Each light began at room temperature and I’d start recording in the dark and turn the light on. Since the meter’s already running, initial readings were recorded somewhere within in a two second window. But so what? IMO initial “actual max” is irrelevant compared to three minutes of output.

You are potentially missing the most important period of lumen sag; the first two seconds. IMO, ignoring this is unfortunate and invalidates your data. The variability in your readings alone causes problems. What if the M1 happened to get sampled right when it turned on, but the EA4 happened to get sampled right around the two second mark? On the EA4, the difference from time zero to the two second mark for me was about 45lm. This does not totally explain how your data shows about 4% sag during the first three minutes and mine shows almost 15% sag during the same time period. Something is still amiss. Did I read somewhere that you also applied forced air to the light under test?
Even my sample rate is limited by the meter; it is documented at 400 milliseconds in the manual.

@texaspyro

@luvlites

@relic38

M1 has sag issues

Big time sag issues. As can be seen in the above graph and longer term here:
Comparing Throw of the EagleTac TX25C2, Convoy M1, UltraFire UF-T50, & Zebralight SC600 Mk II

As cheap saggy lights go, the M1 actually does not sag too bad… It’s basically just not regulated.

Agreed, the M1 is not as bad as some. I still need to investigate what’s going on, I think the star contact may be limited.

For those interested, my thermal testing post is up, here with more lights tested. Future test results will be added to that thread.