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DHgate has the Focus Zoom Lens Cree Flashlight for $10 with free shipping. Cree Q3 3-Watt LED chip, reflector design, 800-meter range, aluminum alloy case, waterproof, and outputs about 200 lumens.
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800 meter range in the sense that you could attempt to point it at something 800 meters away. seeing said something not guaranteed.
Somebody forgot to replace the 'size' with something:
"Battery Type: 1x size 1.5V Batteries (not included)"
More likely is that it could be seen from 800 meters or about a half mile. This would only be likely on a boat signaling or to get help in a rescue situation at night, or at least a really dark day?
Item is confusing. It's driver chip is 3W but the LED is 5W and 200 Lumens.
Well, no they are full of it. This might use a 3W LED, but it's very unlikely to produce more than 100 lumens at less than 3W drive strength. Good thing though, this and almost all AA sized housings can't handle the heat from the implied current it would take to drive a 3W LED at 3W.
So, this is like generic power supplies, they are blatantly lying and should be in prison for it, but at the same time, it is still possible that despite lies, you could end up with something worth $10. To put it another way, there is not any $20, let alone $10, AA light that can run for it's duration at 200 lumens output. Even if one could I doubt you'd want it, the runtime would be terrible from AA cell battery. The bare minimum for 200 lumen output is 2 x AA or 1 x 18650 and seldom the former, sometimes the latter.
I have a few of these LED lamps and the ones with lenses superior to the ones with reflectors.
^ It depends on the beam shape you want, and of course the shape of the reflector or lens being contrasted. A fixed focus lens (with the appropriate degree spread) is usually better for use in a particular activity while a reflector is better for a wider range of uses.
(OT)
#7, I would like to have your opinion on this:
The Magnet Induction Left-right Rotating Zoom Adjustable CREE LED
Flashlight Torch Lamp
http://www.meritline.com/the-magnet-induction-left-right-rotating-zoom-adjustable-cree-led-flashlight-torch-lamp---p-66226.aspx
Confusing is the markings on the flashlight: Dimmer w/ Zoom in and Zoom out. Not sure whether "zooming" Focus or Brightness.
This ebay item seems to be the same one and it says the led is Q5. Does Q5 generate 500 lumens from 18650?
http://cgi.ebay.ca/ZOOMABLE-7W-CREE-LED-Flashlight-Torch-A13-18650-Charger-/140537920256?pt=US_Flashlights&hash=item20b8b67b00
^ I've never seen one of those, don't know what to make of the description either because sometimes Chinese translations go very badly, but I suspect the collar under the head is threaded and moves the head forward to change zoom, while the pushbutton cycles through the 3 modes. That doesn't explain "magnetic induction" though. There is at least one major brand light that uses induction as a sealed system to change operating modes instead of focus, but on this light it doesn't seem likely.
Maybe I'm wrong about it being threaded to move the head and there is some kind of spring tension on the reflector and a magnet glued on two sides so when you rotate the bezel under the head it magnetically pulls the reflector backwards. I really don't know, but it does not appear to be either of the two most common types of lights described as magnetic induction, being those you shake to power instead of charging batteries (very weak novelty lights), or those that charge via an induction coil from the wall adapter instead of a mechanical plug connector but the pictures show the chargers use a plug connector.
I'm always suspicious of lights that seem to have an abnormally low cost, and that is the case with that light because it includes the chargers and battery. I would have to tear one down and inspect it before I had confidence in any assessment, but it is very unlikely to produce 500 lumens, though quite likely to be twice as bright as the typical 1 x AA light.
If the ebay description is right that it has a Cree Q5, it would mean about 110 lumens/watt but that goes down as current rises (past 350mA). Problem is we can't trust which series of Cree LED it is so we know the max current it can handle, nor do we know the driving current they are using.
It is common in this size and price range to drive the LED at about 800mA to 1A. At ideal temperatures far below what the LED will be at in a typical generic flashlight you might produce…
#8
This light is probably great but the battery might be hard to replace. I have this one that uses 3 aaa's http://www.meritline.com/zoom-focus-200-lumens-led---p-36555.aspx and it's so bright it's like another sun came up.
18650 cells aren't hard to find, but costly if bought locally or if you pay shipping from a major battery distributor. They are cheaper and easy to come by at places like http://www.dealextreme.com but a bit overrated and take weeks to arrive. I feel 18650 light form factor is too big for regular pocket carry, but anything that diameter or length I'd want to have at least 2 x AA or 18650 if it were a regular use/work light as the energy density is much better in the latter, given a medium or low mode that would allow several hours of runtime in most cases. I'm not a big fan of lights that try to be as bright as possible for only an hour.
In the former (2 x AA) "most" lights have a boost circuit so you have reasonably regulated light output for most of the runtime. With most 3-cell lights they either direct drive so it progressively gets dimmer till the last 1/3rd of the battery capacity is nearly useless, or they have a buck/pwm regulator that gives you modes but it also drops in light output a lot. All things at their own price though, I have plenty of ~ $10-20 generic lights and doubt I'll ever buy another, preferring something the next notch up in quality.
Thanks for the response, #9 (#11). (Wish Ben stops replacing poster's name with 'bacon'.)
In a way good to hear that you yourself are not sure of on the connection between the magnet induction and the zoom. I was intrigued by the implication that magnet can change focus zoom or brightness. Not sure at this moment to get the flashlight just to ascertain the feature.
Your guess of 200 -- 300 lumens seems more realistic based on the other cheapo/economical flashlights. My guess would be closer to 200 than to 300 lumens, like 210. <g>
I was initially interested in the flashlight as the battery and the charger is included, but then sort of turned off as the brightness claim seems too outlandish. Another strike against it is its size. It's huge: 1.81 x 1.02 x 6.89 in .
#10, I have the light. But this light is noticeably brighter:
http://www.goldengadgets.com/nf558-3-watt-led-flashlight-with-cree-led-and-focusing-lens.html
It's OOS at goldengadgets, but this ebay item may be the same one:
http://cgi.ebay.com/NEW-CREE-LED-300-Lm-Adjustable-Focus-Flashlight-Torch-/110678298508?pt=US_Flashlights&hash=item19c4f0cf8c
(Notice that goldengadgets says 200 lumens while ebay claims 300. My guess is 150 lumens at most.)
I found a flashlight.It's cool and i got one.
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looks very nice.
How about this? I bought it from Beltal.com:
Strong white light LED flashlight / 1*AA battery LED Torch Lamp lights emergency light hikin
$7.46 ~ $9.64 / Piece
http://www.beltal.com/on-sale/strong-white-light-led-flashlight-1-aa-battery-led-torch-lamp-lights-emergency-light-hikin-31175-66478.html
^ That light seems to be fairly dim (25-30 lumens was the only level mentioned), presumably only a 1W, generic LED. You could do much worse for $9 each, $9 is a fair price for what it is, but I would prefer to spend a few dollars more for something brighter and higher quality.