uploaded as a youtube shorts video so I can’t add it here
I found the current information from another forum(【图片】acebeam x75拆机夜射【手电吧】_百度贴吧), can it explain the relationship between current and lumens about the X75？It’s 55.8A of the total battery pack output.
I think have to wait for more review.
But I think high chance it is scam.
X50 - 8LED 3x21700 38k lumens
X50 2.0 - 8LED 3x21700 45k lumens
X75 - 12LED 4x21700 80k lumens (sounds too good to have such advancement with similar type of LED and 4250mAH 21700 batteries)
So X75 is using this battery.
https://www.molicel.com/wp-content/uploads/INR21700P42A-V4-80092.pdf
And current measurement done by X75 owner in the link above. Way above maximum battery discharge specification.
With typical internal impedance of 0.016Ohm of the battery, voltage drop will be higher, 10A will have voltage drop of 0.16v, 20A will have 0.32v of voltage drop, so my estimated calculation of 3.9V at high current is too optimistic. The more voltage drop, the more current it needs to sustain 720W power estimation.
If the current measurement is correct with minimal error, 720W/55.8A/4 = 3.22v per battery.
Or 55.8A*0.016ohm= 0.89v , 4.2v-0.89v = 3.31v per battery.
All Acebeam should have done is advertise the following
Turn On = X
FL1 = X
Instead they state FL1 in the manual for all levels. If they’re not careful they’ll start losing the trust of the enthusiast community.
Just getting ready to take more photos with the drone at a closer range, these should look amazing
Now the question is the safety to discharge at 55A for 45A max discharge battery. Looks like power consumption wise it is there.
And question about the very high efficiency of Acebeam circuit to deliver all these power to the LEDs, or it won’t get to 80k lumens.
More review will reveal the actual lumens number.
One. About 10A above 45A max in datasheet.
This is both scam and SAFETY issue to me.
Acebeam should make X75 takes 8x21700 battery pack and sell this battery pack at cost price to existing buyer. Feels like it is incomplete product with 4x21700 battery pack.
Measure power output in watts. What is maximum power output in watts for 4 batts?
If following specification of max discharge current 45A
(4.2-45*0.016)*4*45 = 626.4 watts
Yeap, looks overpowered, like all direct drive lights?
You mean modded direct drive lights? Sure some extreme expert modders are doing that for extreme performance. But 55A for one 21700 battery is not common.
I am not aware of any stock light that sucks 55A of juice per battery.
here the total internal resistance of the battery pack is 0.0414, so the internal resistance of the single battery is low than 0.0103
the X75 uses the boost driver, here is the link X75 Brightest Flashlight|AceBeam® Official Store | Flashlights, Tactical Lights
wow it does look a bit underwhelming at that pic, if thats how its close to reality what u see with eyes it seems its not worth it… so many lumens and not so big difference ?
i think the flashlight industry needs rules and regulations, stating a light that does 80k lumens but doesnt even hold that for even 10 seconds sounds like a ripoff to me…
(4.2*4-45*0.0414)*45= 672.16 watts
Unless Acebeam handpick every pieces of batteries, else better follow battery datasheet of 0.016ohm internal resistance.
700w boost driver? Maybe, but for low - med modes only. I ques its a buck driver with DD channel. To know for sure we have to know drivers output voltage. Is it so hard to measure?
55.8A?? How long till one explodes…I’ll understand if it was a P45B but the P42A should not be pushed that hard.
https://www.molicel.com/inr21700-p45b/
Manufacturer max discharge current is still 45A, but it has higher capacity and lower internal resistance.
Although lower internal resistance will have less voltage drop hence lower current draw, I think it will still be over 45A max current to get 80k lumens OTF for 12 XHP70.2
I have not had a chance to test the X75 but from my experience with Acebeam products, having reviewed the E70, the E70 Ti and the Rider RX, they seem to deliver both on quality and reliability. I would be interested to see specific measurements on the X75 by someone who has the required equipment.
Marco at 1Lumen has been sent one recently. Cheule measured the 5000K on his calibrated PVC tube and hit 64K, Matt Smith also achieved similar. In saying this though, no reviewer is going to be able to give a proper reading since we don’t have a certified calibration light.
I measured the range tonight at 5 meters and only hit 932 meters for a split second.
Acebeam make great products, but it’s quite common to not achieve their specs, even the range falls short. I reviewed the Rider RX and E70 Mini and this was the case for me and everyone else.