What brand and model of batteries were you using? Some batteries have more amps than others and might power turbo better. Like Samsung 30s.
At first, I was using Samsung 35s, and they worked fine. Now I use Samsung 30s.
(Update 10/23/2020 - I noticed the manual says: “Built-in low voltage protection, which will limit the maximum power output when the battery output is low.”)
I could’ve sworn I bought 8x30Q (15A max), turns out I bought 35E (8A max).
If I’m reading the datasheet for the the 90.2 correctly it looks like it maxes out at 3.8V and 18A (just under 70W). Ignoring inefficiencies of the driver for now - that means when populated with 8 cells (lets say at 3.8V each for simplicity sake) each cell only sees 2.25A.
I know it is a little more complicated than that as the cells are arranged in pairs, then in parallel, but the watts required from each individual battery should still be about 8.55W.
It seems like we don’t need super high drain cells for this light, or at least we shouldn’t. Using my (mistakenly purchased) 35E’s at 4.1V it can run turbo fine with only one carrier populated with 4 batteries and the other left empty.
More testing might be needed, I’m interested how it behaves when low again, might’ve been a fluke the first time.
Update - tested again at low voltage, and running warm.
Short version - I think it was just low batteries, no issues. (easy to loose track of time on turbo with a light like this )
Longer version - When it gets warm it does a slow dim to a lower mode, which is normal, but not the sudden jump to a lower mode I saw the first time. Testing voltage from the tail cap shows it really sagging on turbo, and being that li-ion batteries have a gradual voltage drop under load until they get low at which point they drop off steeply, I think that is what was happening and it suddenly switches to a lower mode. (At first when I tested I pulled the batteries out and checked voltages which only showed me what the batteries recovered to over time, not the voltage under load during the test, so that wasn’t valid.) Maybe if I had been using higher drain cells (30Q for instance) it might’ve been better.
I noticed the same thing, when my batteries were down to 3.92 volts each measured on my volt meter, The brightness stepped down in a couple seconds from turbo the the level down from there.
The batteries were 30Q Samsungs, the light wasn’t hot and it was 47°F outside.
I think it is a voltage issue.
(Update 10/23/2020 - I noticed the manual says: “Built-in low voltage protection, which will limit the maximum power output when the battery output is low.”)
The replacement fan handle for my Astrolux MF05 from BangGood finally arrived after nearly 2 months of back and forth with BangGood customer services. However, the fan handle slide that’s slides into the slot on the light was damaged. I had to file off the damage portion of the slide to make it fit. And the tail cap spring was detached. I was able to reattach it.
All good now. Fan works: 3 quick clicks on, 2 quick clicks to change modes, 1 long click to turn off.
For those of you who have experienced that same issue, here's a video that I used to convince BangGood and Astrolux there was an issue: https://www.youtube.com/watch?v=dtu9nRiODSk
The MF04 should be able to light up something a mile away. I shined mine on a water tower at that distance and I could see it getting lit up.
If you have a tripod, aim the light at the windmill, and then step to the side so the beam doesn’t block your view. Then use binoculars or a camera with a long exposure to view it like I did for my water tower photos from two miles away.
I will have to take out the binos and try again,I didn’t use a tripod either. the windmill is white colored but may be less visible depending on how its facing . Also wasn’t sure how much humidity would affect my ability to see it.
I’ve tried it at 50%, just thought it would be easier.
I ordered the light two days ago,and it is on its way to me now,so I ask what batteries should I use?
I think the old good 30Qs for the 18650s,but I don’t know which of the 21700 one to buy.
I ask,because the price range is huge,ie in NKON.nl. store,I see the price is between €3.45-€19.95.
Any suggestions please?