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.

rtorres201 year ago

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)  rtorres201 year ago

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

ray_Bond5 years ago
this is my ckt under trial..... plz suggestions are welcome on it.
Ac light.JPG
here is a link for that image rapidshare.com/files/416776122/Ac_light_1600x1400.jpg.html
Dipankar (author)  ray_Bond5 years ago
Your Circuit Diagram is not clear for me to check it. COPY / Paste it to Photo shop and Enlarge it.
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_Bond5 years ago
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_Bond5 years ago
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.
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-5 years ago
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, http://cgi.ebay.com.au/New-Product-100-PCS-10mm-40-White-LED-380-000mcd-HOT-/250527563196?pt=LH_DefaultDomain_0 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-5 years ago
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.
i would have voted for you but i am a few days late sorry
Dipankar (author)  tech1234567895 years ago
Never mind.............
shan4djfun5 years ago
voted, good work
Dipankar (author)  nutsandbolts_645 years ago
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)  beehard445 years ago
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.
nice Idea,i vote it Dipanker
japanjot5 years ago
nice work man,best of luck i voted :-)
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.
rimar20005 years ago
Excellent and SEFCUWEG: Simple, Easy, Fast, Cheap, Useful, Well Explained, Green. What more can one pretend? I voted it!
mathman475 years ago
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.
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!