I do the tests by checking the level in a Texas Ace lumen tube. Then I give the light a minute or so to cool/recover, and then turn it on in a cardboard box w/ a cell phone running Ceilingbounce. When the test is done, I scale the output by what I previously measured. I usually check the light output when I end the test, though the lumen tube isn’t so reliable at lower levels. It’s more of a sanity check that the scaling isn’t wildly off. I pretty much always use a small computer fan to circulate air, even if it’s not really necessary.
They aren’t 5000K after de-doming. They are around 3700K. And the B35AM is a quad-die emitter while the 519a is a single die but four of them. You are free to do whatever you want with the info, ignore it if you don’t think it’s an interesting comparison.
Don’t think the gap is that big, this test estimates 9.83mm^2 for B35AM, and it’s reasonable to estimate around 4mm^2 for dedomed 519A. So the actual ratio is closer to 16/9.83 = 1.63.
I am very curious where the efficiency differences come from, and how much of it is at the emitter vs at the driver. The emitter should certainly account for some, since 4x519A has more LES (thus lower power density) AND better heatsinking per unit area.
Thank you for sharing your results!
I didn’t except the difference to be this big, my B35AM lights have great runtimes. My S2+ B35AM have better runtimes and runs cooler than my other S2+ 519A with a buck driver.
Yeah, I also wonder what part of the difference is the driver. It would maybe be interesting to run the E75 at a higher level, but you only have so many level choices on the E75 or the Convoy. The fact they happened to have a level so close to each other in the first place was lucky.
I posted a comparison of the E75 vs the LumeX1 w/ NTG50 in a different thread. I don’t know how the LES compares between the B35AM and the NTG50 though. But it had a runtime (at a higher output level though) that was quite close to the E75. They also take different battery sizes, so that adds some uncertainty as well.
