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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: OlivierAstuces, 06.09.2014, 01:08

If I'm not wrong, when you touch the copper at the end, you are touching a wire that supports a 36V 3A current. Does it hurt ?
Написал: OfficialHardtechnoChannel, 24.08.2014, 23:54

Sorry Julian, but this is sensless since there is no current limitation in the circuit. Even in short turn-on intervalls, the led can (and will) take damage due to the hughe amount of current.
Написал: darryl barton, 16.07.2014, 01:27

I especially appreciate your battery holder. That's clever.
Написал: Charagrin, 01.09.2014, 05:52

I am trying to figure out how you got 40 volts out of 2 18 volt batteries using a inline connection, since creating an in-line connection just adds the AH together and does not "double the voltage." The crossflow of each battery is still capped at 18 volts as that is what they allow to pass through them, just like how flashlights can have multiple batteries stacked inside and yet still operate at 1.5V for example assuming normal household AA's. I understand the difference between series and parallel connections, but in practice if I stack 3 AA batteries in a line I still only draw 1.5V according to my 3 different made testers. SO I am just trying to understand how the voltage magically doubles despite the battery itself being designed to only let so much voltage through.
Написал: Jefferson Asejo, 13.09.2014, 08:52

its hard to carry your flashlight because it is very big
Написал: Fabian Feilcke, 11.09.2014, 17:09

Not particulary suprising. Batteries are a power source rather than a voltage or current source. You simply cannot draw more than a certain wattage from it, as the internal resistance rises with the current. So as long the maximum power the battery can supply is lower than the LEDs Ptot there won't be any issues with the LED. The problem is that if you use this kind of current limitation, a significant part of the power is heating up the batteries rather than producing light. 
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: Marty Vargo, 05.09.2014, 18:14

Polish the metal to a mirror finish and then use thermal paste in between the metal and led and you will have great heat transfer.
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: IIGrayfoxII, 27.08.2014, 12:44

You really should use an LED driver to control the current. I have a 10W LED spotlight. It has a 12v battery to power the LED and it can power the LED if i decided to hook it up directly. But the point of an LED Driver is the control the current the LED gets.
Написал: Sikander Khan, 26.08.2014, 23:19

Bro. Your Thumb Nail is really small, that makes me feel bad for you :(
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: Carl Talbot, 03.04.2014, 19:20

You sir have the world's weirdest thumbs.
Написал: M RealKing, 13.03.2014, 11:23

awesome , and you can drive it with PWM this will be more professional :)
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: 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: Jonathan Dragon, 13.08.2014, 07:55

No pics at night?
Написал: Litruv, 22.04.2014, 11:10

Note that these batteries are like 70$+ each
Написал: geekchaser, 05.08.2014, 03:48

I used to use those same LED's for indoor growing.. 3000k is a fall light spectrum. 6500k would be spring or summer. I would power them with simple cellphone chargers. They worked great! 
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: Hayqal Ali, 05.06.2014, 07:01

WHY YOU DONT WANT TO PRESS THE SWITCH MORE THAN 10 SECOND?
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: 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: Ruter Ralph, 09.04.2014, 11:50

Is this Guy retarded?
Написал: Andrew Rogers, 27.04.2014, 02:05

I love Aussie accents....