After few days of searching, I am not sure how to choose flashight that will make me happy..
Problem is with declared/claimed and real output time and… you know. So, for example some fl should hild 3h in high mode 1300lm, and on test it is 1300 2min then drop to 650lm for 3h. Like Ledlenser p7r core ( I did not good real review) declared 9h output…
If you can help me ti find flashilight that will run with 800-1300lm 3h or more. Great would me 1400lm 5hours.
EDC size if posible, Battery 21700 or 18650, I do not need turbo mode or any spec additional things.
I was thinking something like Nitecore edc35, maybe edc37. Acebeam e75. But reviews hold me back. Price up to 130$
Your expectations are too high. Even 800lm for 3 hours is hard to achieve. You need a low CRI highly efficient emitter for that. Like XHP70.3 or LHP73b. And of course a highly efficient driver, and forget about 18650.
What comes to mind first is Convoy M21H or Emisar DA1K with one of the emitters mentioned (Emisars are equipped with High CRI emitters by default, you need to ask Hank for low CRI version via E-mail).
Exactly, this is what I was thinking about too. And this is without taking into account driver efficiency/losses. And also the stated capacity of a (for example) 6Ah 21700, is measured by the manufacturer at certain specific “optimal circumstances” and might differ a bit in practical use. It’s also depends on what voltage the low voltage protection of the flashlight kicks (with battery manufacturers mostly going down to 2.8V for capacity testing) and if the flashlight maintains it’s output levels until LVP or that it steps down in output below a certain battery level.
All in all, seems like a very hard task for a flashlight to maintain 800lm for 3+ hours on a single 21700.
I actually used term efficiency to indicate I was accounting for this; I was assuming raw lumens and runtime are more important than light quality, so assumed OP would go with something like a low CRI XHP70.3 HD 6500 CCT…
But yes, you’re correct that perhaps I was being over-generous and a more realistic figure is 100lm/W, which would make output/runtime numbers even worse.
This is not possible for an EDC-sized light. The Sofirn Q8 Plus will give you 1000 lumens for 5 hours but it’s the size of a can of soup and takes 3 x 21700 batteries.
The Acebeam L35 V2.0 will do 700 lumens for 4 hours on a single 21700 but it’s too big for EDC really.
What’s the use case? In this small form factor, 300 lumens for 6 hours would be more feasible on a single 21700 or 26650. Using that as a baseline, basic number sense to an inverse proportion between runtime and lumens is a pretty good approximator, a.k.a. lumenhours.
An AA NiMH, 150-200 lumenhours
14500, 1500mAh, 450 lumenhours
18650, 3400mAh, 1100-1200 lumenhours
21700, 7000mAh, 2000-2300 lumenhours.
No EDC sized light exists that can do what you need it to do
The closest thing to that that I know of is the Acebeam 75 (around 1000 lumens) especially with the 6500k LEDs and you’re going to have to carry spare batteries
if you want 1400 lumens Ace beam L35v2 can do it, but not for 5 hours.
Once again you’re going to have to carry spare batteries
I thought I’d answer each post separately, but I’ll write answers to all your answers here.
First of all, I would like to thank you for the specific information, I got more information than after a couple of days of Googling…
In relation to your answers, I see that I really had too high expectations.
I’d rather cut efficiency in favor of size. As far as I can see, Acebeam L35 ver.2.0 seems the closest to what I need. I took into account that even with the old flashlights, I did not use as many lumens as I thought.
Now I need to find a variant similar to the L35 v2, certainly with a smaller head, and if possible with a smaller body.
You have given me led chips to pay attention to so I will look based on that.
I certainly accept if you have a suggestion.
Hi, I think it is just tough, but not impossible, as the first couple of reply suggest, I would also choose emisar da1k, or d1k. I just bought d1 with ntg50, I estimate, that it can sustain 800 lm in 20 ⁰C room. But it is a 9 mm² led with 95 CRI. So If you choose a bigger one with 70 CRI, like xhp70.3 or xhp70.2, you can achive 130-150 lm/w efficiency around 1000 lm, which is exactly what you need. With 21700 6Ah would be 2800-3300 lmh.
Da1k xhp70.3 cca 7 cd/lm
D1k xhp70.3 cca 10 cd/lm
More information about your use case would be helpful. It’s possible you would be more interested in intensity than raw output, and some idea of what you want to use it for and how you want to carry it would help people better tailor their suggestions to your needs.
Hi Perception,
I think it is it’s obvious what I need, it says in the first post. If we ignore my high expectations - I need an edc-sized lamp that can give me 700-800 lumens for 3+ hours. From the answers of other members I realized that it’s not exactly a realistic situation, but it’s not that far off either. For example, as Vlah wrote, the Da1k xhp70.3 flashlight is pretty close. I’m having a bit of trouble getting it, but it’s an option I’m seriously considering.
I was closest to the Nitecore edc35 option before I posted.
