This is a very powerful Flashlight that turns night onto day at a radius of 100 feet.

It uses 60 Bright White LED’s with a Rechargeable 6 volts 4.5 Amps leak proof lead acid Battery. The Charging is done outside the light casing with a 6 volt charger.

Step 1: Step-1

Picture of Step-1

Items you will need are:-


One old Flashlight casing to assemble the light.

60 Bright White LED 5mm

One PVC round base to fix the LED’s.

60 Resistors of 100 Ohms ¼ watt.

One 6 Volts 4.5 Amps Rechargeable Lead acid Battery.

One On Off switch.

Wires, Solder, etc.

Step 2: Step-2

Picture of Step-2

Follow the Circuit Diagram and fix the LED’s on to the PVC base.

Care is to be taken to maintain the POLARITY of the LED’s.

The PLUS side is Positive and the MINUS side is Negative.

The Resistors should be soldered on the Negative side of the LED’s.

The on / off switch should be on the Positive side.

Step 3: Step-3

Picture of Step-3

Fix the Battery in the Flashlight casing with a lock so that it will not fall off.

Assemble the whole circuit and fix it in the Flashlight casing.

Step 4: Step-4

Picture of Step-4

Your Power packed Flashlight is now ready.

Switch on and Enjoy.


Yonatan24 (author)2015-09-10


LI-PO Battery

Adjustable COB LED

Don't you need a heat-sink for the LED's+Resistors?

Dipankar (author)Yonatan242015-09-10


rtorres20 (author)2014-03-16

Hi there, I want to ask you, why are you wiring the resistors to the LEDs ground? Aren't we supposed to limit the incoming voltage? Thanks for any info on that!

Dipankar (author)rtorres202014-03-16

Same result if you put it to + or -, it limits the incoming voltage.

ray_Bond (author)2010-09-02

this is my ckt under trial..... plz suggestions are welcome on it.

ray_Bond (author)ray_Bond2010-09-02

here is a link for that image

Dipankar (author)ray_Bond2010-09-02

Your Circuit Diagram is not clear for me to check it. COPY / Paste it to Photo shop and Enlarge it.

Sergei- (author)ray_Bond2010-09-02

The pic is a bit blury to see all the components in it, do you have the led's in series? Not the best idea to have them in series if they are, if one blows then the lot won't work and good chance of blowing them all up to if there is a spike and they are in series you will need high voltage to run them. Do you have a charging circuit there for the battery because i can an ac diagram with a rectifiar

ray_Bond (author)2010-09-02

Good one dipankar bhai. I search domestic market and i found some of the led torches uses 8mm super glow leds with voltage rating of 3.3 -4.5v and 25mA .but, i did with 30 super glow 5mm leds with power rating of 25mA and voltage of 3.3V; with 108 Ohms quater watts resistors.It is the safe operatng poing for super glow 5mm leds so i did in this way.It will glow more then any normal leds, i never counted in mcds and with life period of nearly 60 - 70K hrs. but the problem lies with battery it will consume much of power and dosen't last for more than an hour and half . still i am working on making it less ampers consuming one. i found one alternate solution for battery; which is to use 4.5A 24hrs capacity battery instead of 4.5Ah battery....................................

Dipankar (author)ray_Bond2010-09-02

Hi ray_Bond, Your Quote (which is to use 4.5A 24hrs capacity battery instead of 4.5Ah battery....................................) 4.5 Amp means 4.5 Ampears for one Hour and not 24 Hours as \you understand. Please check from your Battery dealer or ask someone who know about Batteries. Battery Ampere mentioned on the Battery always shows in ONE HOUR. NOT 24 HOURS.

ray_Bond (author)Dipankar2010-09-02

yes dipankar bhai i know that i asked same thing to a battery factory owner and he told me that they make two types of batteries one which gives 4.5 Amps for one hr and another which delivers 4.5 Amps for 24 hrs. although i dont tested them but he said with confidence that i said it may be possible who knows ................ and for pic i make it to work on AC 220 V this is not that good one ckt but i am testing it. my main idea is to make something like that in very cheap rate so i did this although there are some issues which i hv to consider. it is still under consideration

Sergei- (author)2010-08-30

Hi Whats the specs of the led's you are using V-f, I-f Just wanted to calculate the average time of use I have concidered doing something like this for a while as well But was intending on using the more powerful led's Have a look at these ones, one of them could replace a bunch of the smaller ones you are using and still won't heat up as much as the led's that need heat sinks, but will need to concider if running time to the amount you put in will be enougth with the battery power you have installed Serg

Dipankar (author)Sergei-2010-08-31

Hi Sergei, The LED's are 5mm, 10,000 to 12,000 mcd. Though they take up more space they are cheap and very bright. I prefer to use them rather then the "White-LED-380-000mcd" because if they pack up your money is gone. The battery also goes for a long time without recharging.

tech123456789 (author)2010-08-13

i would have voted for you but i am a few days late sorry

Dipankar (author)tech1234567892010-08-13

Never mind.............

shan4djfun (author)2010-08-10

voted, good work

nutsandbolts_64 (author)2010-08-10


Dipankar (author)nutsandbolts_642010-08-10

Yes MOTHER of all Flashlight.

imagine the LEDs were the 2w versions. the whole casing must be made of copper to act as a heatsink....

Dipankar (author)beehard442010-08-10

For this model no Heat sink required. I have been using it for the last six months. All my Instructables are time TESTED, for any defects.

auramale32ml (author)2010-08-09

nice Idea,i vote it Dipanker

japanjot (author)2010-08-09

nice work man,best of luck i voted :-)

trike road poet (author)2010-08-09

I have an old lantern just like this, time to make it work better then one lousy old incandescent bulb ever could! Now this is a project, easy, packs a wallop in the light department, and gives that old lantern from the back of my old pick-up a new life.
Thanks, this is the sort of project that just is perfect, combining the old and the new in innovative ways!  I'm voting on this one.

rimar2000 (author)2010-08-09

Excellent and SEFCUWEG: Simple, Easy, Fast, Cheap, Useful, Well Explained, Green. What more can one pretend? I voted it!

mathman47 (author)2010-08-09

Now I have something to do with the old flashlight. It never did work right, but it has the perfect housing for this project. Thanks, Dipankar. +5 for you.

scraptopower (author)2010-08-08

Sweet, can we have a photo of it on, I bet it's awesome. Soldering those LED's and resistors must have taken a while!

About This Instructable




Bio: Now I am a retired person, who enjoys life and making small things to pass the time keep myself busy.
More by Dipankar:20 LED’s on Mobile Charger8 mm LED on ACLED SunGun
Add instructable to: