@warpedrotors Never heard of 26650 batteries until now but I would be willing to use the 21700. Doesn’t sound like much more but they do have a 46% more volume than the 18650 and is what is used for the Tesla Model 3 so they are being created in large volumes.
I don’t have a charger for that size or any flashlights that can use it but would be willing to upgrade if more things start using 21700’s in the future.
@elpepe@squishybrain Nothing that I can see with the batteries themselves. The only potential issue I can come up with is that average households don’t tend to keep stock of C and D size cells (presumably due to their higher price and limited general use in comparison with AA and AAA sizes), so unless you do keep a bunch of them around, you’ll have to go to the store to buy more when your light dies, or else risk not having the light when you need it. (I have the same issue with D cells and vintage boomboxes!)
@decoratedwarvet@elpepe@squishybrain In my experience (which is considerable) small flashlights with inbuilt rechargeable batteries still can’t approach the brightness and battery life of ones with replaceable cells. I’ve got a Feit Electric 3 C cell flashlight, and it’s probably the single best flashlight I own. VERY bright, great battery life, and solid and durable.
@decoratedwarvet@elpepe@ponagathos@squishybrain I own several 18650 flashlights, and those aren’t what I was referring to when I mentioned ‘inbuilt’ rechargeables. Rather, I meant smaller, cheaper things with non-removable USB rechargeable batteries. 18650s are considered replaceable.
Also the 1-18650 (or 2-CR123) cell Nitecore Concept 1 is also pretty good for a super compact rechargeable/disposable cell flashlight. I would trust quality CR123’s cells to outlast any alkaline C cell for usable storage time. ($60 flashlight only, $20 more with a 3100mAh 18650 cell and charger.)
@kbaum17@2many2no That Guidesman link does say 3,500 lumens but I seriously doubt it. Many companies exaggerate the lumens ratings just like many Chinese companies claim to sell 18650 batteries with 6,000 mAh when reputable companies like Nitecore and Panasonic sell maximum capacities of 3,500 mAh.
A flashlight putting out 3,500 lumens should cost a couple hundred dollars, take around four 18650 batteries, and probably have a safety lockout to prevent you from blinding someone by accidentally turning it on to max brightness. You can set paper on fire with a flashlight that bright.
It is definitely possible to start a fire and melt materials with the light from a flashlight. A lot of what comes out the front is not just visible light, but infrared as well. I can melt holes in a dark blanket with my Emisar D4 and start a fire with my Imalent DX80.
@kuoh FYI, that so-called 18,000 lumen flashlight exceeds CREE’s maximum output spec of the XHP70.2 x 4.
According to CREE, the manufacturer of the LED, you can get a max of 4,292 per LED. That’s 17,168 lumens maximum the flashlight could produce at optimum conditions. If the company exaggerates a figure higher than the manufacturer, they aren’t too trustworthy in my opinion. People have commented on that product page that if the flashlight is able to get 18,000 lumens out of those LEDs, the company should tell CREE about it so they can update their specs.
I hate how companies put a distance in their spec: “Max beam 622 meters.” What happens at 623 meters, the photons drop to the ground?
For anyone that doubts flashlights can start fires, here’s the Crazy Russian Hacker demonstrating it.
And @kbaum17 , my laser comment was because you stated it is impossible to start a fire based on brightness. You didn’t say based on the brightness of a flashlight. Like you hinted to, you can concentrate the sunlight with a lens and start a fire. There are devices specifically designed to cook food using the sun. Another demo here:
My oven generates heat by using coils to generate IR light which is outside my visible spectrum but it is light and it is very hot and can easily burn things. You saying that bright light cannot start fires is definitely wrong.
@cengland0 Yeah, I know it’s not 18,000 OTF, but it’s definitely going to be a lot more than the 3500 lumen mentioned for the price. Also, it’s not uncommon for some manufacturers to drive LEDs beyond their rated specs to get more lumens at the expense of longevity.
@kbaum17 Please re-read my comment. I did not mention my microwave. I mentioned my oven which does cook by using light in the electromagnetic spectrum. The flashlight generates visible light around 10^15 hz, my oven generates infrared light somewhere between 10^12 to 10^14 hz.
Light of any frequency will heat surfaces that absorb it. So if you shine a flashlight that is bright enough on an article that absorbs it and is flammable, it will catch fire. Didn’t you watch the video I linked above with the demonstration?
Lumens and heat are different as you stated – However, when the photons (which is a form of energy) are absorbed, they are converted to heat. That’s how bright (high energy) light can start a fire.
Light, a.k.a photons is a form of energy. Heat is a form of energy conversion. It is very easy for a flashlight to emit enough photons so an object that it is hitting will convert that to heat and start a fire. Watch that video.
haha. The video of the crazy Russian, who touched the paper to the hot lens? lol that’s your real world proof??
Look, go buy a 3500 lumen flashlight at Menards. shine it on a piece of white copier paper, 12 inches away from the lenses, at full power and leave it on and at that distance until the batteries die. You will NOT get a fire. good luck.
they (the internet) sell AA-to-C battery adapters. take a aa, makes it a C. less battery life than a regular C… but waaay better than buying stupid C batteries that will leak before you get a chance to use them all.
So, I’m somewhat of a flashlight nerd (I’ve been known to drop terms such as “EDC” and “membrane switch” during romantic dinner dates, which helped end those dates quicker, allowing me to get back home to my true passion: flashlights), and I have to say that those lumen figures appear a bit overstated.
You’re just not gonna get that much brightness out of a single lamp, even the best in the industry (which this one won’t be, since it’s not even stated what it is), and about 6-7 watts of power (assuming a roughly 1A discharge rate based on the 3 hour figure for the big flashlight and loss due to discharge inefficiency at higher drain rates). That’s like 300 lumens per watt, which is basically experimental tech at this point. A third of that is more realistic, and what you would find in a quality product today.
So, this is not as bad as those $6 Chinese lights that promise 8,000 lumens on a single 18650 cell, but it’s still not exactly truthful.
Although the mention of pulse width modulation significantly increases this product’s technobabble score. You can expect the inverse reactive current to really juice up those unilateral phase detractors:
@ShotgunX@stolicat Are you sure you considered McMillan’s Structural Dynamics of Flow and the arrangement of the spurv-plinth girdle-jerries on the husk-nuts with Donnelly spacing at a vent hatch depth of 1/2 meter?
@mike808@stolicat Vent hatch depth of 1/2 meter? All you’re gonna get out of that is contra-regulated chain deprogrammation leading to a bunch of inversely-reticulated splines, and good luck cleaning that up. You can’t just throw McMillan around willy-nilly without accounting for all the Javitz index offsetting you’re gonna experience. I swear, kids these days don’t know anything about vibrometatronics…
@ponagathos - Woot had a sale on Dorcy Python Flexs some time back; I bought two and have never looked back. Well, I HAVE looked back but with the flashlight hung around my neck, as long as the rechargeable AAs have some power, I can see that I made a good decision, and have my hands free to boot.
@dino2269 Actually, the 3-AAA flashlights from Dorcy were pretty cool IMHO. They’re perfect for what I need it for which is hanging/clipping under my desk when I have to crawl under there to do something to my PC or the rats nest of wires down there. I don’t need them to last for a long time on a charge. Definitely I would not use them as a primary flashlight. (I also chucked one of the 3AAA Dorcy flashlights in the back of my car just for emergencies.)
These ones are not to my liking at all since I’m into rechargeable lithium flashlights for flashlights of this size and refuse to buy any alkaline powered flashlights of this size/configuration.
in for 3 sets…one set for a Christmas present for my neighbor…One set for me so I can carry in my car to replace my prized 80’s 4 d cell maglite with LED conversion and vintage Night Ize grip and the 3rd set to give my wife so she can beat me for buying more flashlights, lol…
Bought this off Massdrop: Folomov 18650S 900-Lumen Tactical Flashlight and very happy (and I haven’t even received it yet!). Do better meh, also here’s my referral link if anyone wants $10 credit on their first order: https://www.massdrop.com/?referer=X3ZGEW