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
Step 2: Filament Connections
See where filaments of the energy saver bulbs are connected.
Step 3: Short the Filament Points
Short filament 1 connections together
Short filament 2 connections together
Remove filament joining capacitor
Step 4: Bridge Rectifier
You need a ultra fast switching diode uf4007 or similar and 0.1uf 400v capacitor
Step 5: Add BR on the Circuit Board
Step 6: Connection Wires
Here you will get about 100V DC and 130 mA current
Step 7: Make a Series of LEDs
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.