I tried blowing smoke-rings with a cigar, and sticking the light through them, but couldn’t get any rings to “stick”.
could I have your opinion on these flashlights? are they less good than those you have advised me? 
:
https://www.fasttech.com/product/9661322-authentic-ultrafire-uf-a28-led-flashlight
Lumintop ODF30
Astrolux MF01
https://www.amazon.com/Powerful-Flashlight-12xLEDs-Rechargeable-Batteries/dp/B07F3VW2WP/ref=as_li_ss_tl?tag=shopperz_origin3-20&ascsubtag=317610217-2-&SubscriptionId=AKIAJO7E5OLQ67NVPFZA
https://www.amazon.com/Brightex-Tactical-Flashlight-Resistant-Protected/dp/B07D5GBN8W
convoy L6 ?
Anything from Ultrafire, the Brightex zoomie, and the no-name 12 emitter light are objectively less good than a BLF Q8. They are most likely lying about their performance, poorly built, and possibly a fire hazard with poor quality included batteries. The others are different.
The Catapult is a compact dedicated thrower. It has a much more focused beam, much less output, much smaller battery capacity, USB charging, and a much smaller overall size and weight.
The ODF30, and the similar Thrunite TC20 are fairly floody lights otherwise similar in design to the Catapult.
The MF01 is a large, floody light similar to the Noctigon Meteor. I expect better build quality from the Meteor. In either case, the Nichia 219C option has a high color rendering index for more sunlight-like light.
I thank you for these explanations
I am surprised to see all the great features of the DS4 and also for the security is very good
in fact, that’s why i prefer the 6000K, because i have this led projector that is 6000K :
http://image.noelshack.com/fichiers/2019/02/7/1547340615-22039227.jpg
and when i turn it on at night with, it’s a pure white i like … but you probably all right here because you are much more expert than me, and the 5000K must be better. i will choose 5000K and listen to you
Thank you very much for these very technical explanations i will write down everything you just wrote to me to remind me
5000K is a warmer light than 6000K. In my opinion 5000K is like very, very warm sunlight like you have in the morning or evening. 6000 to me feels more like high noon with a cloudy sky. It really is just a matter of personal taste. I for example am one of the people who prefer 6000K over 5000K in a flashlight. Not as the main light in my living room, but for my work light.
I think the D4S is a very good choice and so is the Sofir/BLF. What you have to understand though is, that LEDs emit heat when run on full power. The bigger your flashlight is, the better it can transport the heat away and the longer you will be able to use on a very high brightness without it getting burning hot. In reality just about EVERY modern flashlight won’t be able to be used in the brightest mode (usually called “Turbo”) for more than a couple of minutes. For some it is even only seconds. So if you don’t mind weight at all but only need high output for extended periods of time it usually is a good idea to go for the biggest light you can. And forget about those “super bright” lights on Amazon, Ebay or local stores that nobody ever heard of anywhere else and where you can find no reviews of. They are lying about the output 99% of the time.
finally sofirn Q8 is an evolution of blf Q8? he is a little better then? But you advise me to buy even better by taking the emisar d4s which will be the best choice? if so i will buy it with the link you gave me:
https://intl-outdoor.com/emisar-d4s-26650-high-power-led-flashlight-p-932.html
but there are things that i do not understand in the link:
what do you mean this? :
Aux LED :
Cyan (by default)
Amber
Green
Red
and what’s the use of Magnet in the tailcap?
under: Led & Tint
What is the best for you that i should check? If i have to add 15 dollars i’m ready to add if it’s really better?
I am a little disappointed because there is no battery delivered with 
what is the best battery i will have to buy? I’ll take 2 because you told me that the lighting lasts less than the blf Q8 …
I thank you for your expertise and have analyzed the models i quoted
There isnt such thing as the perfect flashlight. The blf q8 has very good output with around 5000 lumen and nice throw and flood. And it handles the heat pretty well.
Maybe you can specify more what you would like from a flashlight?
EDIT after reading you @kanton, and thank you for teaching me to avoid flashlight “no name” or unknown on amazon, ebay and others of the same kind where they lie fortunately i knew your forum by luck thanks to a person on a forum who advised me your budgetlight forum
so after reading you too, i hesitated again now between sofirn Q8 and emisar ds4 … i do not know what to do …
For maximum capacity and low heat, I would just get the Sofirn Q8.
You can leave a message with your BLF username in the Aliexpress order to get a discount down to 40$US if I remember well.
Ah gotlib, you have started down the path of no return to ……. Flashaholicandia. Most of us are there already. You will recognize us when you get there: We have BOTH the G4S and BLF Q8. And we have many, MANY other lights. Beware!
To answer your questions above:
The Sofirn/BLF Q8 is available at: Amazon.com
The Thorfire/BLF Q8 (the original Q8) is at BLF Q8 5000lm Super Bright 4xled Tactical Flashlight Multiple Operation Torch for sale online | eBay
None of these come with batteries. Few flashlights do. Therefore factor on adding the price of 4 batteries. Batteries for this light are 18650 cells that are Button-top/Hi drain/Unprotected. There are a zillion opinions about which batteries are best (Samsung, Sony, Panasonic, LG……) I’m not going to venture an opinion. :nerd_face:
You have the best link for the D4S. The Aux LED is a decorative very, very dim set of LEDs that stay on most of the time. They come in the colors you list. Photos of these are at the website you have. They look cool and make finding your flashlight easier in the dark.
If you decide to order the D4S, order two of the batteries offered on the same page. Simple. Can’t go wrong.
The Magnet in the tailcap is exactly that: A very strong magnet that lets you stick the light to a metal surface. This is handy if you work on the engine of your car. Attach the light to the open hood.
LED and Tint: Based upon how you describe your use of a light and your color (tint) preference, I believe you will be happiest with the SST20 5000K. The SST20 5000K throws a beam farther than the XP-L HI V2 3A 5000K and saves you $15. I don’t think you will be happy with the SST20 6500K as too much color is lost.
Thank you very much for your very complete answer to my questions and all your links, it’s really nice!
Just before reading your answer, i had read the one from: Polarweis just above,that i also thank, and i had an idea that i had already had several weeks ago! : watch youtube videos! So i typed: blf q8 vs sofirn q8
and there are several videos!
I saw this one:
but i’m not sure that sofirn in the video is first? Can someone confirm me?
if sofirn is first, she totally convinced me packed! we see immediately what lights further and has more lumens, the lighting is stronger and in + the light is whiter more beautiful thanks to leds XPL HI! it is better than blf q8, it is not for nothing if it is a little more expensive;)
I read the comments of this video and a person is talking about: ThorFire S70S
I then looked at the specifications of the ThorFire S70S, which seems pretty good to me, it has the led XHP70 and illuminates 3h45min to 1800lumens which is huge and 55min in turbo has 3960 lumens and 87000 candela, throw very far , but it is also more expensive, unless i can find it with a coupon code but i doubt …
Edit finally after seeing this video of the ThorFire S70S
i did not find it terrible it illuminates much less wide than sofirn Q8. on the other hand it has more candela and throw further and that’s all. So my choice i think will sofirn q8
In the Video, Sofirn in first.
Q8 is good, don’t get a smaller light.
For long run-times at high output you need size, for both heat dissipation and battery capacity.
I also often use this super site that indicates and compares the lumens for each LED flashlight 
:
can you tell me why manufacturers sofirn q8 for example did not put 4 xhp70.2 instead of 4 xpl hi?
is it for a reason of cost because after its price would have doubled and more intersted the buyers of flaslight “low cost”? Or because it would have required several other larger and more expensive batteries?
i’m looking at this one too:
Sofirn SP36
it has only xpl2 but yet Amazon announces 6000 lumens while my link led announces that the xpl2 are about 1050 lumens? so amazon will lie for this one i think …
There are lights with 3-4 xhp70 leds, this particular one does not use them.
Cost would be higher (both leds and driver), and if no other changes made (same host/mass) the difference would be more light, less throw, more heat, smaller run-times.
Lol, exactly my thoughts
The Convoy L6 is on sale at Banggood now for 38,99
Good deal though.
Putting in XHP70 instead of XP-L would have not only cost more, but would require different much more expensive electronics, would produce much more heat, have less throw, and put out a worse looking beam.
The Sofirn SP36 uses 4x XP-L2s with a FET driver, meaning it runs directly off of the battery on turbo, so the XP-L2s are pushed beyond 1000 lumens.