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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: 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: 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: Василий Григорьев, 04.08.2014, 04:58

Ну может и 10$
Написал: darryl barton, 16.07.2014, 01:27

I especially appreciate your battery holder. That's clever.
Написал: Hayqal Ali, 05.06.2014, 07:01

Написал: geodangleon, 16.05.2014, 13:33

Just bought a 100w led for AU$7.99 (for fun) and a 600w 10-60v to12-80v Buck boost step up power supply for AU$20. My question is, do you think i can set the power supply to the sweet spot of the led, and run the setup from a 12v battery? PS your videos are awesome :)
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: gabigowriel, 18.04.2014, 04:42

@Julian Ilett 1:12 OH SHIT, I almost fell of the chair... 100 WATT LED?! why?! ... great video!
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: Kevin Godwin, 24.08.2014, 14:46

that is a great idea
Написал: Carl Talbot, 03.04.2014, 19:20

You sir have the world's weirdest thumbs.
Написал: Emmanuel Lopez, 02.04.2014, 06:57

Julian that is just awesome, thanks for sharing and also pointing us to where to buy the LED bulb, thanks and hope to se more of your videos!! (Y) (Y)
Написал: denvera1g1, 14.05.2014, 04:26

i used a $15 DC voltage transformer, and i didnt know this at the time but the voltage in does not effect the voltage out, i originally tested a 50 watt 34v LED with an 18 volt 3 amp lab grade DC PSU, but when i measured the output of the transformer it came in at 24v, so instead of fiddling with the tiny adjustment screw on the transformer i just upped the voltage on the PSU from 12 to 17v, and the output voltage didnt even register a change with my digital meter still at 24.06v. then just for shits and giggles i dropped the psu down to 7 volts, and holy hell the output was still 24.06v. and even under load 9v 3 amps from the PSU came out as the now optimized 32.5v, and bringing the PSU up to 18V 2.3A the output voltage from the transformer was still at 32.5V, i am no electrician but i always thought that the output voltage depended entirely on the input voltage. anyways TL:DR invest in a 15USD variable voltage constant output transformer, even though your battery's voltage might change you can be guaranteed that the voltage at the LED will not
Написал: cdb8315, 17.08.2014, 22:26

Nice build! Any thoughts about going into production?
Написал: thirdarc, 17.08.2014, 08:05

Can I get a model number for this??? i find it hard to believe you got legitimate 100W emitter for under 10 UDS... 
Написал: M RealKing, 13.03.2014, 11:23

awesome , and you can drive it with PWM this will be more professional :)
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: norbu1987, 08.05.2014, 07:54

is this led found in big screen led TV? or those led tv uses regular small led?
Написал: Chevez E, 14.08.2014, 12:54

Nice, and to think that there are much more powerful led chips out there like Cree's monster 18,000 lumen CXA3590. I want them for my hi-beams.
Написал: Jonathan Dragon, 13.08.2014, 07:55

No pics at night?
Написал: 1977Harrier, 08.08.2014, 20:53

Just a thought but you could add some thermal paste in between the LED and make-shift heat sink to improve conductivity. A small tube should cost no more than a couple of quid.
Написал: A li, 06.08.2014, 14:46

try it on outside night time