I am using this idea since last six months, it just came in my mind (why not experiment).
DANGER HIGH VOLTAGE
You need the circuit of an energy saver bulb whose tube is burnt or damaged.
This is a high voltage and high frequency generating circuit, be careful there is high voltage present if you connect it to AC line. There is a high voltage input capacitor (from 2.2uf to 10uf 400 volts). The idea is to put a bridge rectifier on the output on this circuit and use for LEDs.
A 23 to 25 watt energy saver’s output can produce 165 mA current (it is written on it) for the energy saver light bulb. We need to use this constant current output for our LED lights. By using bridge rectifier (ultra fast) you can get 100 volts of DC. A high frequency switching output cannot be rectified properly by using normal bridge rectifier like 1N4007 or similar. We need an ultrafast diode to make a bridge rectifier like UF4007,BYV26 or similar.
Step 1: Open Energy Saver Bulb and Remove Its Tube
Open energy saver bulb and carefully remove its burnt tube from the top. Be careful its glass tube.
Step 2: Filament Connections
Identify filament connections and joining capacitor.
See where filaments of the energy saver bulbs are connected.
Step 3: Short the Filament Points
Short the filament points using soldering iron
Short filament 1 connections together
Short filament 2 connections together
Remove filament joining capacitor
Step 4: Bridge Rectifier
Make bridge rectifier and add capacitor on the output
You need a ultra fast switching diode uf4007 or similar and 0.1uf 400v capacitor
Step 5: Add BR on the Circuit Board
Now solder the bridge rectifier to the circuit board from where you have removed the filament joining capacitor
Step 6: Connection Wires
Now add connection wires to the output of the BR +ve and -ve
Here you will get about 100V DC and 130 mA current
Step 7: Make a Series of LEDs
A 0.5 watt at 3.3v LED consumes 150mA current so it is safe to make a series of 30 LEDs. You can use small LEDs of 20 mA current in multiple strings till the output current and voltage matches (30 LEDs in each string)
LEDs can be assembled on a heat sink insulated material or if using 20mA LEDs then on PCB. When circuit is ON Do not touch the LEDs or any area of circuit as there are high voltage present . I have used 23 to 25 watt energy saver circuits. There are 45 watt and 85 watt circuits available which can produce more current (a one watt of energy saver bulb will consume 7.2 mA current so 45 watt can produce 100V and 320mA). In this way 1 Watt LEDs can be used. Following light is consuming 230V at 53mA input and producing 12.5 watt light.
Step 8: Complete Light
Here is complete light it is rated 12.5 watt. At the AC 230v input it is consuming 53 mA current.
Step 9: Other Big Light Using Two Energy Saver Circuits
Runner Up in the
LED Contest with Elemental LED
me.baban made it!