For what they are, they are very handy. My wife got a couple about a year ago and they have held up very well!
I have a Nebo Boig Magnum Larry I saw at my local Ace hardware but ordered on Amazon. Great work light. Super strong magnet and wide, smooth, floody beam. Rated at 450 lumens and looks at least that bright to the naked eye. My only complaints are the UI (must click through all modes to off) and visible PWM in the lower mode but under the hood its not an issue. I would like to see a good low mode on it for extended emergency lighting.
Really 350 lumens the ones listed at banggood??
I saw some that run on 4 x AAA batteries. Anyone have these? Are they brighter or do they run longer?
I have a friend who is a Heating and A/C tech. He said he and the guys he works with all use a light like this for their work. He likes that it will shine into a small space and light it up evenly, without being too bright. He also likes that he can clip it onto the outside of his shirt pocket, so it will light up a small area directly in front of him for working. I tried to give him something brighter and he said it was too bright for the small spaces he works on. My contest light this year is (very loosely) inspired by this style light. But, it won’t be nearly as shirt-pocket friendly.
I have several of these from NEBO and a West Marine branded one. Pretty neat, handy little lights.
In answer to the OP’s questions………
I did a quick search and THIS PLACE has COB Emitters for sale.
Here is a link to a search for COB EMITTERS .
I got a bunch of the NEBO COB Lights HERE at LIGHT JUNCTION a while back when they were having a super sale.
40 - 50% off best I remember. 
Got several for me and a bunch for gifts. I just find they are handy little lights to have laying around. :+1: …. I run em’ on Eneloops of course. 
> search … link
On a quick scan, those look to be 12-volt COBs, and I don’t know any drivers appropriate to that voltage for handheld lights.
Does anyone have a pointer to the COBs and drivers that are being used for the small flashlights?
Any takeaparts?
I searched for “5v COB” and found these little 4.5v, E10 screw-type lamps (but high to very high minimum quantity order)
XREF,
prior thread here:
Advice for COB and 3x xm-l2 drivers
Yep, seems they are 12 Volt. I was in a hurry and didn’t pay close attention. :person_facepalming: … My bad.
Ive seen some pretty cool iphone cases that have COB and their own battery. Seems cool but i dont have an Iphone.
I received my cob lights (from the link in the OP and in Post 5). They are both nice, but I really like the pen light from the OP. It’s better than I expected. The aluminum body is thick and seems strong. I’m impressed with the amount of light this baby puts out. Very even wide flood as expected. The tint and color rendition is great. The light spreads out so wide and evenly, that you don’t have to worry about glare (Like DavidEF’s friends have said).
The magnet on the clip is fairly strong. The tail magnet is pretty weak. I can really see keeping a few of these in my car. Engine problem at night. Stick one on each side of the hood (by the clip magnets) and you got your self a nicely engine bay.
Don’t know what the run time is like yet. Seems like it may not be long with so much output. Will try to see how hot it gets and how long it runs tonight.
I guess this vendor is selling them at such a low price due to the logo. These go for much more everywhere else I have looked. I had a problem with a third item I purchased (not a light). It was the manufacturers fault. The vendor straighten out the matter on the spot for me with just one private message from me. So I ordered 8 more of these pen lights. Some to keep in my cars and a few for my parents who I know will really like them.
Thanks for this thread hank. I will probably pull one apart when I get the next order, but I doubt I mod it. Might put in more powerful tail magnet. Actually, wouldn’t mind a few modes.
EDIT: Added more content.
I have the pile of these in plastic and aluminum. got a couple more red aluminum in the other day.
Got a pic of the tail magnet? I think it may be in backward. I do not think any of mine are weak on the tail magnet. and I think in comparison the clip magnet is weak to the tail. Tail magnet has a steel surround or a cup. You should be able to see the steel ring around the edges. If not I would say it’s in backward.
Had important things to be doing so I skipped all that and did this. I will be keeping this one. UMMM, its definitely Brighter.
If you need to get one of these apart just get a fingernail between the side of the lens and aluminum and pop it out. Rest will easily follow. Don’t forget the rubber cap on the SW. You will have to take it apart AGAIN.
Eh? what did you do to make it brighter?
went from this
to This
See, Brighter now. 
Appears mine is backwards then. Thanks for the tip. Also, thanks for the tip on how to break down the light.
So, it appears that the LED has no real heatsink path to the body. Unless there is hidden circuitry in the switch (doubtful), the emitter is direct drive with 1.5 ohm resistor bank in series. There are plenty connections and thin wires that add to the resistance. Hmmm, getting some moddy ideas.
EDIT: Sorry for the multiple edits. Had trouble getting my response out of the quote.
Welcome Sir,
would like to see what you do with it. I didn’t count the LEDs or try to see what the potential voltage of the COB is. Nor try running it and check heat generated. Definitely watch the SW wire in the housing slot, putting it back together. I thought to slip some heatshrink in there but didn’t. Yeah, replace wires too, but didn’t. Certainly could add a strip of aluminum behind the COB, there is room with the spring loading the way its made.
after I got mine apart I could only assume my buddy’s light that melted the lens got shorted. Maybe burned a resistor. But his is also the plastic housing…? I will be in CT tomorrow, visiting. I have his replacement. I’ll dissect his plastic version. Spare parts…
Ah yes got IR stuck to the fridge for a few days too (the red linked in post 1 or 5 from AliExpress)
Both magnets hold it good on the slippery fridge side.
I do not have good rechargeable AAA cells so when turning it on just now is was extremely dim
I Gould however count the lighted dots and it has 16
^
IR?
Yeah, the cells used will totally determine output on these guys. Maybe pull the resistors if you know you will be using low performance cells.
I probably won’t mod my pen light much as you can only do so much with 3AAA’s as a source for power. I think these pen lights are fine stock. I may do the mods discussed by vwpieces above. What I would like to do is build high performance 18650 version with DTP, a driver, and a glass lens. I like DavidEF’s Scratch Build idea even more now after using one of these.
Well, you could make one for your Scratch Build too! I’d like to see what you’ll come up with.