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Monster 7,500 Lumens 100W LED Flashlight for under $10

Продолжительность: 00:06:31

I discovered that due to a lucky co-incidence of voltage and internal resistance, a 100W LED can be connected directly across the terminals of two 18V Nickel Cadmium power tool batteries. And that means you can build a 100 Watt (7,500 Lumens) flashlight for less than $10 (not including batteries). Note: Don't try this with other battery types - you'll almost certainly fry the LED!

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Написал: darryl barton, 16.07.2014, 01:27

I especially appreciate your battery holder. That's clever.
Написал: readyrepairs, 07.03.2014, 09:58

not 10$ ... youve got 2 50$ batteries... and a dollar of wood... and 5 or so dollars of other materials. change the title.
Написал: MrTuts4life, 11.03.2014, 21:27

I had no idea how sensitive leds are so I got a strip of 24 leds wired in series and randomly put a 9V battery to the end and it worked perfectly!
Написал: peatear42, 17.02.2014, 04:21

Is that the "powerplus elephant" in the back? 
Написал: MrKaschi, 01.02.2014, 23:23

you dont use led driver? have you chek the current?
Написал: gamerpaddy, 19.02.2014, 00:03

check the china step-up converters (search for 150W stepup on ebay), it transforms 12V to the 33V needed for LED. i built 2-3 flashlights with it, check my channel.
Написал: James Wilson, 01.03.2014, 01:33

Imagine that built into either a Projector, Disco Light or used for a general Light in your room!!
Написал: Jared Connell, 06.04.2014, 16:00

cool video, I don't think the title is quite fair though because the batteries alone cost more than that. I understand that you can use them for other purposes but I don't think that if you mad this to use regularly you aren't going to want to take the batteries out of your drill all the time. I also wish you would've done something about a reflector and lense, switch, heatsink, etc to make it more usable because I want to make one to acutally use frequently and would like an example. 
Написал: Garry M, 30.03.2014, 01:47

$10 if you dont include the very expensive cordless batteries which would then just make it a bulb. If you want to make this you have to include the cost of all parts else it makes it pointless.
Написал: James de Luna, 17.05.2014, 15:40

Would love to see a more compact, rechargable and focusable version, something to rival the led Lenser x21r .... Retails at more than £200 
Написал: Sumutiu Marius Xmaster, 08.03.2014, 03:46

You need electric pulse to keep the LED lighting and not burning. 5 - 10 Hz to keep the LED lighting for 2-3 minutes without burning itself. It would be like light-pause-light-pause-light-pause-light-pause-light-pause/second Don't use sinusoidal fwaves. It will burn your LED.
Написал: Loris Cianni, 16.03.2014, 13:47

Hi, i have one 18v and one 12V, it would works?
Написал: Litruv, 22.04.2014, 11:10

Note that these batteries are like 70$+ each
Написал: Kketansa Art, 17.04.2014, 07:24

I have a 50 watt LED spotlight, and to be able to keep it turned on forever, it has a huge more than 2 kilo chunk of metal body as a heat sink.
Написал: BitBastelei, 13.01.2014, 22:03

@z1power I've don't this in the past. I used some thermal glue to add a old CPU fan, the projectors fan will do the rest. Biggest problem is the light distribution - leds emit usually a very narrow beam so you might get a bright center and dark edges without special lenses
Написал: Brandon Bates, 11.04.2014, 06:42

I seen this same thing at Walmart for 49 cents. Why did you pay a POUND (I know is british money. Im not talking about LBS for my fellow Mericans) for that O.o
Написал: Carl Talbot, 03.04.2014, 19:20

You sir have the world's weirdest thumbs.
Написал: orbiter8 (John), 09.01.2014, 13:54

Interesting build there Julian, I've got a couple of those 100W LEDs too. Just waiting for a project to come to mind to use them on :) I was considering getting a couple of the lenses you can buy from eBay for these LEDs just to focus the light a little better. Have you tried the lenses? Cheers mate John
Написал: norbu1987, 08.05.2014, 07:54

is this led found in big screen led TV? or those led tv uses regular small led?
Написал: jusb1066, 09.01.2014, 13:22

cameras also tend to turn off if you point them at the sun, i guess its to protect itself. I do have 3 small 12v lead acid, this may be a fun torch to make with those
Написал: Ruter Ralph, 09.04.2014, 11:50

Is this Guy retarded?
Написал: Artemus Rodricq, 05.03.2014, 23:02

what about a peltier cooler?
Написал: Andrew Rogers, 27.04.2014, 02:05

I love Aussie accents....
Написал: Jerry G., 02.05.2014, 03:14

It would be best to use a simple current limiting. I calculated from the spec sheet shown a 1.2 ohm / 5 Watt resistor in series should work okay. Once on a heat sink the LED will be allowed to seek its own quiescent level in relation to the battery supply he is using.
Написал: Julian Ilett, 09.01.2014, 13:07

Build a 100W LED Flashlight for less than $10