Picture of How to use burnt Compact Florescent Light Circuit Module
Note and precautions: CFL's contain mercury which is hazardous material, so it should be handled accordingly
Most CFL lamps, electronic circuits are working perfect and are still useable, only the bulb goes defective. CFL circuit of 18-24 Watts are useful for the activation ofreplacement type two feet 18-20 Watt Florescent Tube Light bulb.

Step 1: Find a CFL

Picture of Find a CFL
You will need a CFL as shown in picture. Any CFL of which bulb is defective, broken or has outlive its life is useful for this modification. Drive voltage may be according to your country 110 Volt or 220 Volts. In my country (Pakistan) voltage standard is 220/230 Volts.
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IzakB1 month ago

I opened up exactly such a Philips lamp today (in South Africa) and it is pretty similar instead of the rectifier bridge on the bottom of the board, this one has 4 x 1n4007 diodes and a 3.3uF 400V electrolytic capacitor (4.7 in your image). Inspect that capacitor carefully. On mine it is bulging slightly, indicating that it's probably cooked a bit. I suspect it was cooked by the lamp heat, as 400V should be more than sufficient for the 325VDC (remember, 230VAC is RMS, peak will be higher). If the cap is bulging, don't use it.

hadii.khokhar2 months ago


sherwyndrulz3 months ago

do i need to connect the tubelight starter along with the circuit or just connect the circuit directly to the tubelight ?

MIHIRP25 months ago

hello all..

can i use 40w electronic choke to light up 11w cfl tube...

it is very tough to find 11w ballast in my town....

iffee (author)  MIHIRP25 months ago
40w will require at least three 11w bulb in series.
awesomelumens11 months ago

It works fine. I am already using 40 watts tube with 23w energy saver's circuit BUT it is dim than 40 watt ballast

you can use 32W for 40W bulb

iffee (author)  awesomelumens11 months ago

Some time wattage are written fictitious. The transistors used in the circuit may reveal actual wattage. You can replace it with a 20 watt tube lamp.

guille4496 made it!5 months ago
100% funcional. para gente q le guste regalarle a sus cosillas una segunda vida con un consecuente ahorro dw dinero.
samira99m5 months ago

Can we modified the CLF (compact light florescent) circuit into induction heater circuit thank you

iffee (author)  samira99m5 months ago

Simply No.

Roger446 months ago

Great idea.

A T2 8W tube lit up when connected to a 11W CFL, thereby proving the T2's ballast must be dead, and not the tube. A T4 6W also lit up on this CFL.


iffee (author)  Roger446 months ago
Thank you. In my experience these CFL ballasts accept wide range of
lamps with light output variation. I usually use 23 Watt ballasts with 20 watt lamps.
rdramesh9 months ago
How can we find what is voltage atviutput terminal?can we use is to make led bulb ?
Don't get me wrong, I'm glad to see the electronics being recycled. What is the voltage that drives the various CFL tubes? It would appear to me that many of the power supplies provide 400VDC to the tubes. Is this correct? Do any of them provide higher voltages?
The Sky Pirate
Think of all the CFL bulbs going into landfills and the Mercury from those bulbs going into the drinking water and the worlds oceans.
The Sky Pirate
uadil2 years ago
Awesome Job :)
patrickvaz2 years ago
Hi, this is was a great info. thanks for everything.
Just a query, I have a CFL lamp, it needs a electronic ballast, works with 2 pins only as seen in the pic, can you suggest what needs to be done. cheers
iffee (author)  patrickvaz2 years ago
@patrickvaz. Your question is not clear to me.
I have a CFL with 2 pins(26 watts GE) it need a electronic ballast operating at 230v ac, i have attached picture of the CFL, thanks for the interest. regards
kishore2 years ago
It was good recycling of CFL Circuit detaily explained project .I would like to ask you as I got circuit from old burnt out 8W CFL Blub .can I use for 18W Florescent light. will it work or I had replace some components on circuit, and does this circuit from CFL save electric consumption do reply....
iffee (author)  kishore2 years ago

I have not tried but guess,
It may not work or may work with dimmed light.
kishore iffee2 years ago
Thank you for your reply..What wattage CFL blub circuit you have used for this explained project.
iffee (author)  kishore2 years ago
18 to 25 Watt CFL will drive 18 to 40 Watt tube lights.
40 watt tube light was a bit dimmed. If you are from India then you may visit some "Kabaria" to get CFL modules. Good Luck
ant0ny2 years ago
Very simple and very great idea! Thanks! :)
Good one and I always got confused of tube wirings unecessarily......
kemog6 years ago
Hello, this is understandable and easy to accomplish. And I am interested for same thing but in car usage (12 V). do you have any ideas or instructions about using good parts of CFL with smaller fluo tube which can fit in rear part (trunk) of a car. Thank you!
iffee (author)  kemog3 years ago
I have circuit from talkingelectronics.com

12V Fluro inverter

I built it and using since last 3 years, It is very efficient if built according to
the instructions,
wolfy_90057 years ago
Nice. Would it be possible to remove the but you attack to the wall and make a handle so you can use it like a portable shop light?
iffee (author)  wolfy_90057 years ago
It requires connection to the wall plug, so may not be convenient to use as shop light.
joinaqd iffee6 years ago
nice instructable,by the way im from Bangladesh..salam
iffee (author)  joinaqd3 years ago
Brother Wa-Alekum Asslam
msw1006 years ago
Great instructable You show a picture of a philips bulb with straight elements but the circuit is from the spiral CFL do you have the pinouts for the straight element bulb?
The straight flouro tube has two pins at each end. There is a low-wattage incandescent coil between the two pins at each end; just connect the two pins from one end to the wires that are next to each other on the electronics board, and the same for the other end of the tube - you should have four wires on the board which were originally connected to the spiral tube. Try to imagine the spiral tube "unwound" into a straight tube and you'll see how it works.
iffee (author)  MairseyDotes3 years ago
@MairseyDotes. Well explained
pako3 years ago
It's a good idea, I have a lot of dead cfl circuit and standby
using them as sources of high voltage, now installing it on old
lamps with ballast heavy and noisy, so
noise disappears and the ignition will be faster.
sun_ray20503 years ago
but with 40W FL
soon will try with twice electronic ballast
adi19774 years ago
Hello Sir

Its a great project. Please let me know can we connect 20X1watt led or 8x3watt led connected in series with a 20 watt cfl module. What changes have to be made.
iffee (author)  adi19774 years ago
This is not suitable for LED type lights.
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