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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: PhantomAct, 12.10.2014, 14:45

Seems useless to build an LED that you can light up for a couple of seconds... can you make it light up for longer?
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: jimvandamme, 30.10.2014, 14:46

You won't get 20,000 hours out of your flashlight unless you carefully control the heat and current of your LED. Then again, you are not going to run it for that long anyhow. It's the internal resistance of the batteries in series with the resistance of the LED that limits the current. Heftier batteries would have less resistance and be worse for LED lifetime.
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: BlancGivre, 18.11.2014, 03:51

I wonder, what are these 100W LED normally used for? Car headlights?
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: Chris Weghorst, 02.10.2014, 13:24

you moron use a freaking resistor already, 220 ohms 200w should do the work
Написал: Jefferson Asejo, 13.09.2014, 08:52

its hard to carry your flashlight because it is very big
Написал: darryl barton, 16.07.2014, 01:27

I especially appreciate your battery holder. That's clever.
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: nicholas cremato, 14.11.2014, 09:28

Next is to use an old magnifying glass as a lens and away we go! 
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: александр сергеевич, 05.11.2014, 18:38

сгорит так ***** диод
Написал: MaxxHuey1, 28.10.2014, 03:18

I am just guessing, you will need a 100 watt LED driver to regulate the amount of current otherwise you will eventually burn out the LED anyway even thought you have the correct limiting voltage. The is because as the LED gets warmer, the resistance across the LED start to get lower allowing more current to pass through, this vicious cycle goes on until the LED burn out... Please correct me if I am wrong... :-)
Написал: Shorty15c4007, 07.10.2014, 17:28

3:30 You just nuked yourself. 
Написал: ЭДИК РУСИН, 04.10.2014, 16:19

с таким охлаждением сгорит за 10с. проверено!
Написал: liquidthex, 29.09.2014, 02:37

Under $10! Except the wood wires washers screws ...twin 18v battery packs... all just sitting around my garage (carport?) :) Cool video anyways! enjoyed it
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: Alongkorn Kongdeedai, 16.11.2014, 14:38

goods job
Написал: Pat P, 13.11.2014, 23:37

area lamps like that would come in really handy during power outages.
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: Milo Tidwell, 10.11.2014, 18:49

A lot of HP Printer power supplies are 34 Volts as well.
Написал: Emirkan Oyunda, 15.11.2014, 16:28

Lan tek yorum atan Türk benim zaaa
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: RICHLES01, 10.11.2014, 22:27

The 3000ma is more important than voltage. You need a current regulator