How to make a mains operated LED lamp with 19 white LED's.<br /><br />Perfect recycling here !!<br /><br />Old B22 base used from a discarded compact fluorescent lamp, old parts removed, resistors, bridge rectifier and LED's fitted. Hotglue gun to put circle and base together.<br />Electrical tests and measurements done and video clip made to share with the rest of the world.<br />Voltage: 240 Volts<br />Current: 16 milli Ampères<br /><br />Materials used:<br /><br />5 x Resistors, 1 Watt carbon 2k2 ohms<br />4 x 1N4007 diodes<br />19 x 5 mm Ø white LED's 12000 MCAD<br />1 x old B22 base<br />1 x circle cut from PVC or perspex (cut with holesaw)<br /><br />Basic principle behind the lamp 240 Volts - 57 Volts for the 19 LED's requires a 11 k.Ohm series resistor of about 2.8 Watts.<br />For better cooling I prefer to use 5 x 2k2 ohm 1 Watt resistors in series to give me a good safety margin.<br />The bridge rectifier reduces flicker of the LED's. 100 Hz in my case, 120 Hz with American frequencies.<br /><br />For use on 110 or 127 Volts systems I recommend to use 4 x 1k5 ohm 1 Watt resistors in series.<br /><br />Safety !!<br /><br />Working with mains voltages requires safe work practises, unplug before touching.<br />Check that the resistors are not too hot and rather over rate then under rate them.
