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!

Rating Rating Rating Rating Rating 
Views: 889,978
Added: 9 months
Runtime: 6:31
Comments: 516

Tags for this video:  

Find more videos in the: "Tech"
Uploaded by: Julian Ilett
See more videos uploaded by Julian Ilett

Related Videos:

Updates to 12V 100W LED Hardware - Heatsinks, Grease & Lens/Reflector
Rating Rating Rating Rating Rating 
Views: 318840
To run a 100W LED from a 12V battery you need a few bits and pieces. A high power boost converter to generate the 36 volts at about 3 amps. Lots of...
Make An L.E.D Illusion Mirror!
Rating Rating Rating Rating Rating 
Views: 980370
How to make an L.E.D infinity mirror. Really cool illusion piece and pretty simple to make! Twitter- Facebook-...
Brightest flashlight in the world_20000 lumen
Rating Rating Rating Rating Rating 
Views: 760029
300W HID with 20000 lumen Weight 12 pounds Operating time with full accu 45min. Sorry for my bad english, but this is not a english lesson! This...
Fenix PD35: So Bright It Should Be Illegal!! - Preparedmind101
Rating Rating Rating Rating Rating 
Views: 400627
SHOP AND SUPPORT PM101: New Flashlight!! The Fenix PD32 is one of the hottest flashlights out right now. A pocket light...
Dangerous GU10 LED Spot Light is Cheap and Bright but could Kill You - Seriously
Rating Rating Rating Rating Rating 
Views: 1010040
This GU10 LED spot light is cheap (£3 including postage) and bright. But it's also lethal! There's a 50% chance of putting live mains within a few...
Make your own Shard Light
Rating Rating Rating Rating Rating 
Views: 377620
In this video I will show you how to build a really awesome shard light. To create this shard light you'll need the following materials. An LED...
Extreme Speaker Test 21" Driver Pop
Rating Rating Rating Rating Rating 
Views: 1713905
2000w 21" Speaker Test
My 100 Watt LED Flashlight
Rating Rating Rating Rating Rating 
Views: 132940
About two years ago, my friend Will purchased a 100W LED from ebay with a plug-in power adapter. I thought I could do better, so I got a bunch of...
HOW TO: Convert Fluorescent RV Lights to LEDs
Rating Rating Rating Rating Rating 
Views: 149787
UPDATE! We're upgrading our LED conversion with high-end LED tubes. See how we did it here: We purchased our LED Strip...
ไฟ led รถยนต์ Make a LED Car Light Plexiglass Wire a LED 12V Tips and Tricks
Rating Rating Rating Rating Rating 
Views: 93851
ไฟ led รถยนต์ Make a LED, how to wire a led in car, Car interior wire single leds light, how to make an led 12v light, Car Inner lights, wire a led...
how to install iPhone Light Mod Glowing Backcover MOD set with Installation Shining apple Logo
Rating Rating Rating Rating Rating 
Views: 440880
The LED lights in your home could be spying on you!
Rating Rating Rating Rating Rating 
Views: 240387
EDIT: I may be misunderstood, the description should read "An LED light can be used to transmit audio", many people are misinterpreting this to...
12 kW Halide Lamp
Rating Rating Rating Rating Rating 
Views: 185821
12 kW Halide Lamp Do Not Try This Yourself Sound Track...
Bec cu led H4 1800 lumeni pe Logan
Rating Rating Rating Rating Rating 
Views: 292866
prezentare testul discutii...
Update+ Billion Candle Power Xenon Torch Bulb
Rating Rating Rating Rating Rating 
Views: 300998
Update with a 10-30kW Short Arc Xenon Lamp 43 volts 400-800+ Amps These lamps are used in Daylight Simulator systems for high speed video crash...
100W HID The brightest road registered car in the world 82,000 Lumens
Rating Rating Rating Rating Rating 
Views: 822080
This is our GU Nissan Patrol fitted out with our lattest HID Xenon high performance driving light kits. 3 x Lightforce 240 Blitz on Bullbar 100W...
DIY Super Cheap and Bright 50W LED light for Video (for HDSLR video)
Rating Rating Rating Rating Rating 
Views: 84016
Мощный светодиод 30 Ватт
Rating Rating Rating Rating Rating 
Views: 101268
Мощный светодиод 30 Ватт представляет собой светодиодную сборку, состоящую из 100 кристаллов, размещенных в одном корпусе.Конструктивно он состоит...
ProyectosLed #47: linterna led 100W, parte 1
Rating Rating Rating Rating Rating 
Views: 40772
Ahora si, la linterna un poco mejor armada, con el driver correspondiente. Las pruebas estaran el el proximo video:...
How To RGB 8x8x8 LED CUBE - The BUILD!
Rating Rating Rating Rating Rating 
Views: 312318
Parts List-Schematic-EagleFile-ArduinoCode: Code Link:...
Nitecore TM26 (Review & Field Test) - 3,500 Lumen QUADRAY Tiny Monster Flashlight
Rating Rating Rating Rating Rating 
Views: 159637 Umm... the words "wow" and "overkill" are the most commonly used terms in reference to the light that we review today: the...
Crazy Lights LED indirect lighting for the ceiling.
Rating Rating Rating Rating Rating 
Views: 865360
Installed 4 strings of LED crazy lights on the back of the crown molding in the tray of our sunrooom. These are awesome for the money. Comes with...
The best flashlight comparison on youtube!
Rating Rating Rating Rating Rating 
Views: 616038
The best brightest flashlights on market comparison on youtube on a rainy day! Those things are about 2200 lumen (SR90), Tiny Monster TM11 (2000...
8000 Lumen LED 100W vs. my flashlight
Rating Rating Rating Rating Rating 
Views: 173450
checking out my new LED.. it's a 100 chip ~100W ~8000lumen. im running it here at about 31V and 3.2A. i took the video in manual mode of the camera...
flashlight,32000 Lumen,most powerful,48xml
Rating Rating Rating Rating Rating 
Views: 472913
Movie 2013: X-LED Ultimate, 48 CREE XM-L U2 at 1,8 Amp NEW Website NEW------XLED 2014 Flashlights-- with...


Author PhantomAct (12 days)
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 OlivierAstuces (1 month)
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 Marty Vargo (1 month)
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 OfficialHardtechnoChannel (2 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 (22 days)
you moron use a freaking resistor already, 220 ohms 200w should do the work

Author Jefferson Asejo (1 month)
its hard to carry your flashlight because it is very big

Author darryl barton (3 months)
I especially appreciate your battery holder. That's clever.

Author Fabian Feilcke (1 month)
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 Charagrin (1 month)
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

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 Shorty15c4007 (17 days)
3:30 You just nuked yourself. 

Author ЭДИК РУСИН (20 days)
с таким охлаждением сгорит за 10с. проверено!

Author liquidthex (25 days)
Under $10!
Except the wood
...twin 18v battery packs...
all just sitting around my garage (carport?) :)

Cool video anyways! enjoyed it

Author James de Luna (5 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 Jared Connell (6 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 Carl Talbot (6 months)
You sir have the world's weirdest thumbs.

Author spudxxx1 (5 days)
what kind of driver would i need to power 10 100watt leds

Author M RealKing (7 months)
awesome , and you can drive it with PWM this will be more professional :)

Author norbu1987 (5 months)
is this led found in big screen led TV? or those led tv uses regular small

Author Jonathan Dragon (2 months)
No pics at night?

Author Litruv (6 months)
Note that these batteries are like 70$+ each

Author Nathan Tremblay (19 hours)
nice, a whole 6-10 seconds sounds like a whole lot...

Author geekchaser (2 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 (5 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 Hayqal Ali (4 months)

Author Bonnie Flory (11 days)
I need a watt translator.
A 100 watt of this LED light would equal how many watts of an incandescent
bulb ?

Author Justin Steer (3 days)
Would be far better to limit the current correctly with a resistor allowing
longer use and longer life of the led. Also if you cut lots of slits into
the metal, you could easily increase the surface area of your heatsink, and
therefore its efficiecy. However this is no flashlight the word flashlight
implies a portable handheld device .... this is not :) Nice though.

Author Josh Ross (3 days)
yeah but dose it blend

Author Piramerd Arete (10 days)
China invests hundreds of billions of dollars each year in research for
making things affordable and practical. Today China not only make things
for the world, but also started to design new ideas - A BBC documentary.
Thank you China!

Author Brandon Bates (6 months)
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

Author Budd Rollins (10 days)
How about getting a led driver so you can plug it in, no¿

Author Kketansa Art (6 months)
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.

Author taylorID1 (19 days)
Twin & earth mains? Forgive this American for not speaking "English" but
that looks like our 14-2 UF except color coded red/green vs black/white. Is
that wire in common use for residential indoor or outdoor application in
the UK (assuming that's where u are)? With its moulded ground, that would
be used underground here in the US

Author Ruter Ralph (6 months)
Is this Guy retarded?

Author Andrew Rogers (6 months)
I love Aussie accents....

Author Pablo Saquero (15 days)
buena Tesla

Author Duane C (27 days)
Between the cost of those batteries, and the short lighting time, I think
buying "16" 9 volt
batteries ($8) ? set up in 4 "4 packs" at 36 volts in parallel would give
you a longer lasting light in a more compact system.

Author santos cota becerra (20 days)
Poder The fucking led

Author j7ndominica (18 days)
I was sure he's not gonna point the camera at the bright light. But then he
goes and does it. And the camera lives, apparently.

Author Stacy Williams (1 month)
Could make a super joule ringer and use smaller batteries or just one drill
battery nice design . 

Author vincent sit (26 days)
wouldnt this + a 12v battery or PSU be a more suitable power source?

Author geodangleon (5 months)
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 :)

Author FulvioGal (24 days)
Could not you add a switch?

Author Harry de Vokone (23 days)
Hello Julian i build a 10 watt version and i moutend the led on a pretty
big heatsink with thermal paste but the top of the led is getting so warm
that it is too warm for my finger is this normal?

Author Victor Silva (29 days)
I would have at least checked the voltage drop across the LED. Turning it
on for a few seconds and seeing it light is not enough to declare it a
working flashlight.

Author stmounts (28 days)
Your torch is so ugly, who would want to carry that load of crap around?
Why not modify a 'proper' torch, e.g one that takes a 6V lantern battery,
so it doesn't look like a piece of crap???

Author hilton_marc (28 days)
How do you charge the batteries ? 

Author Roy Thorne (1 month)
A simple addition of a pc CPU heat sink and fan, and a case. and you're

Author StinkyCheese9999 (3 months)
If that heatsink is adequate for more than a few seconds then it can't be
operating at 100W. If it is not operating at 100W, it isn't producing
7,500 lumens.

Author Randy H. (1 month)
Window Licker!

Author MrTuts4life (7 months)
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!

Embed Video:


Search Video

Top Videos

Top 100 >>>


Check PR