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



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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Added: 10 months
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Uploaded by: Julian Ilett
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Comments:

Author PhantomAct (1 month)
Seems useless to build an LED that you can light up for a couple of
seconds... can you make it light up for longer?

Author Loren Husky (2 days)
Could these be used to grow plants?

Author OlivierAstuces (2 months)
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 ?

Author jimvandamme (28 days)
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.

Author Marty Vargo (2 months)
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.

Author MaxxHuey1 (1 month)
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... :-)

Author BlancGivre (10 days)
I wonder, what are these 100W LED normally used for? Car headlights?

Author Jason Leo (5 days)
sorry but this video is complete shit. firstly how is it a lucky
co-incidence you can use 2 18v batterys? loads of batteries exist and
therefore it would be always possible to find 2 to work and secondly whats
with the fake title to get views? ryobi batteries are what £30 each so to
make this would cost £70 for yours or £30 using cheaper batteries. so no
you cant make this for $10 dollars because without batteries its half made

Author OfficialHardtechnoChannel (3 months)
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.

Author Chris Weghorst (1 month)
you moron use a freaking resistor already, 220 ohms 200w should do the work

Author Jefferson Asejo (2 months)
its hard to carry your flashlight because it is very big

Author darryl barton (4 months)
I especially appreciate your battery holder. That's clever.

Author Fabian Feilcke (2 months)
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. 

Author nicholas cremato (13 days)
Next is to use an old magnifying glass as a lens and away we go! 

Author Charagrin (2 months)
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.

Author александр сергеевич (22 days)
сгорит так нахуй диод

Author Shorty15c4007 (1 month)
3:30 You just nuked yourself. 

Author ЭДИК РУСИН (1 month)
с таким охлаждением сгорит за 10с. проверено!

Author liquidthex (2 months)
Under $10!
Except the wood
wires
washers
screws
...twin 18v battery packs...
all just sitting around my garage (carport?) :)

Cool video anyways! enjoyed it

Author Louis Riddle (1 day)
did anyone say how long these ryobi batteries would last?

Author Larkhill21 (1 day)
Nice ideas on the battery pack, but maybe attaching the heat sink to the
wood is worth stating that its only to used for a short time.

Author James de Luna (6 months)
Would love to see a more compact, rechargable and focusable version,
something to rival the led Lenser x21r .... Retails at more than £200


Author Alongkorn Kongdeedai (11 days)
goods job

Author Pat P (14 days)
area lamps like that would come in really handy during power outages.

Author IIGrayfoxII (3 months)
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.

Author Milo Tidwell (17 days)
A lot of HP Printer power supplies are 34 Volts as well.

Author Emirkan Oyunda (12 days)
Lan tek yorum atan Türk benim zaaa

Author Jared Connell (7 months)
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. 

Author RICHLES01 (17 days)
The 3000ma is more important than voltage. You need a current regulator

Author Johnny Truong (15 days)
hahahaha That made me laugh so hard with the LED in the lens of the camera.

Author Thomas Thompson (24 days)
SICK!!!

Author Carl Talbot (7 months)
You sir have the world's weirdest thumbs.

Author spudxxx1 (1 month)
what kind of driver would i need to power 10 100watt leds

Author GEORGEMONTEVERDE (16 days)
Very educational... Thank you!!!


Author Craig Nehring (18 days)
Is there a lower voltage sweet spot that will illuminate that 100 watt LED
but will not generate as much heat and at a reduced lumen output?

Author Joseph Perrotta (20 days)
The sellers spec sheet says 32V to 34V. The combined full charged voltage
of a 18V battery is around 19-20Volts. That being the case you would be
pumping at least 36 to 40Volts into this LED How long do you think it will
last before you burn it out?
It may work well for a few seconds give it 10 minutes with a 36V ebike
charger attached to maintain the voltage. See what your results are then!

Author Mihael Tominšek (18 days)
What the hack you've been thinking about to point 100W LED directly to
camcorder. I was thinking, he will move it aside right. No, he will just
plugit... o man. You've been lucky. But still camera may produce dead
pixels very soon.

Author fromnewark (18 days)
You didn't measure the current or voltage. My guess is those batteries were
putting out a lot more than 100W

Author M RealKing (8 months)
awesome , and you can drive it with PWM this will be more professional :)

Author norbu1987 (6 months)
is this led found in big screen led TV? or those led tv uses regular small
led?

Author vijay verma (25 days)
I love your skills

Author Jerry G. (7 months)
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.

Author Ride84XL (25 days)
Best thing to drive this would be to build a constant current power souce.
For these power levels it would only cost a few dollars extra. A good thing
would also be to use a CPU cooler for a computer to cool the LED.

But that wont be as simple as this one - of course. I like how it just
flashed out the camera :)

Author Chris S (26 days)
Was für ein Voll Iddi schrottet seine Cam schier mit dem doofen LED Chip
lool dafür gibts alein schon nen Daumen Hoch hahahahaha

Author Jonathan Dragon (3 months)
No pics at night?

Author Kim Wonjun (29 days)
How to make that ??

Author Litruv (7 months)
Note that these batteries are like 70$+ each

Author Nathan Tremblay (1 month)
nice, a whole 6-10 seconds sounds like a whole lot...

Author geekchaser (3 months)
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! 

Author James de Luna (6 months)
Would love to see a more compact, rechargable and focusable version,
something to rival the led Lenser x21r .... Retails at more than £200


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