A few years ago I bribed non-eBay, ready-made LED modules (how good they are: they cost about 35 rubles / pc; an almost finished lamp, just insert into the case): why not use them? At the dacha, I did not throw anything away (such a “plushkin”!) And I had a lot of such lamps.
The LED module is a rectangular plate - 42x42 mm with 12 LEDs type 5630-0.5 soldered on it, connected in series.
It is made of fiberglass. On the front side of the SMD components - there is a diode bridge and resistors. On the reverse side there is a metal film capacitor (which sets the current through the LEDs) and electrolytic (for smoothing the ripple.
The circuit diagram (approximate) is presented on figure.
If we calculate the current flowing through the LEDs according to the formula I = (C1 * (U-U₁)) / 3.18, where I is the current in mA; C1 = 1.5 μF; U = 220 V; U₁ is the voltage drop across the LEDs (3 V x 12 = 36 V), then we get 87 mA. If the maximum current through the 5630-0.5 LEDs is 150 mA, then at this cooling current the module is not required.
Energy-saving light bulb assembled on snaps
and understands very simply. It is only necessary to be extremely careful so as not to damage the flask (in the flask, the poisonous substance is mercury, and it must be disposed of).
then to insert a "glass" (since the lamp has no galvanic isolation). Then he milled a landing for a future board.
In order to protect against electric shock, a “glass” was cut out (from the packaging from the headphones)
and pasted it inside with superglue glue.
The LED module was first cut with scissors for metal, and then fitted "tightly" with a file.
Soldered to the cap - everything, the work is finished.
So in half an hour you can assemble a fairly solid LED lamp. The lamp almost does not heat up (after an hour of work in the table lamp it’s barely warm). According to calculations, the lamp should give out about 3 watts, but in fact - 4-5 watts (due to the thermal temperature of 4200 K). It costs in stores about 120-130 rubles. (Now, probably, more expensive). The lamp turned out to be quite tight, so it can be used outdoors (by the way, I use it on the porch cottages).
Note. I replaced the capacitor with 50μFx100V. He just exploded in me. Indeed, capacitors must be rated for a voltage of 2 times the peak voltage.