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Picture of Cheap LED Retrofitting
Ah! In this instructable i will describe how you can convert those old small tube lights in better and more efficient LED Lights that doesn`t even hurt your pocket!
As we all know LED`s are - good, long lasting,efficient and easy to play with!

Let me share a small anecdote:
I had this really small sized Tube light that i used during some late night reading. It served me good for about 2 years and then it would abruptly close down after a few minutes. It had those so-called power efficient electronic chokes to start and drive it. After a  quick run to the spares shop to get a replacement choke for my light, i found out that , these  chokes are no longer in stock (Mine was a low power one, higher ones were still available). Adamant, i came back home and decided to replace it with a LED Replacement.

So, to get started you will need :

Electronics:
LED`s (3x1 Watt) (Moon White/Warm White)
Wires
LED Driver (You build you own too using either a ac stepdown transformer with a Buck Conv. or Linear Regulator( Less Efficient))
I decided to buy one because the cost of building one was somehow more than the product.
These are readily available on the internet
like this , this or this . I managed to find a local source for the same, who after some bargain was willing to sell it to me for about 2.2$ . If anybody needs it in India, they can surely ask! :D

Tools:
Screw Driver
Drilling Machine
Wire Cutter
Heat Shrinks
Soldering Iron


Mechanical Stuff:
Screws
Steel sheet (for making a heat sink)
Heat Glue 
Butter Paper 

Just the above materials and you are all set for making a LED RetroFit!

COST:
So, i just too me about 2.2$ for the driver and LED`s worth 1.4$, which is 3.6$
To resurrect an old Tube Lamp into a modern day LED Lamp!

Just in case you don`t have a similar model, the instructable still applies, as you make use of several tricks i used in any of your high power LED Project! 



 
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The way you have connected the LEDs is not exactly right........ Each LED (white) requires 3.2 v to work..... With a maximum current in your case of 350mA........but you are supplying....4v to each led which is greater then it's critical voltage of 3.6v...... And the current can vary according to the capacity of your LED driver...... So i suggest you use a current limiting resistor with 6.8 ohm resistance....... The resistance is calculated like this resistance={12-[3×3.2]}÷(350×10^-3)
indiantinker (author)  krishna.cool.948492 months ago
Hi,
You are correct. But in my case the voltage of the driver on No Load conditions and full load condition is not same. When completely loaded the voltage drops down to about 10V and hence adding a resistance would have been useless in that case.
Oh........ Okay then. ^^
thebriguy8 months ago

I found you can just rough sand the 'lens' (bulb cover) and that diffuses the light. You have to judge if you would still need the butter paper :-)

Thanks for the instructable

bhvm1 year ago
very nice work. butter paper diffusion is a great Idea. please give your views on my project- http://www.instructables.com/id/Transform-a-boring-old-Table-lamp-into-2800-Lumen-/step4/wicked-2800-Lumens-of-Retina-burning-power/