A Literally pink LED lamp I Chose the pink one from the colors they had because it seemed like the correct thing to do and it perfectly matches the Hideous pink lamp holder. Let's plug it in and see what the power consumption is. I'm using the anti this time with its slightly dimmer display it is lit pink um and the power consumption is 5.2 watts and power factor 0.6 which is typical and I'm wondering: is this using white LEDs under a pink cover or is it actually magenta? LEDs for maximum efficiency. There's only one way to find out and that's to open it.

So let's open it. I shall get the other stuff out the way and we shall disremember it foreign ER Let's Zoom down this so you can Marvel at the shredded flash when everything goes horribly wrong. So I'm going to slip that down there I'm going to just work my oh, that wasn't hard. Oh, it's pointy LEDs Oh, it's got a little boost I should say it's got a little Buck regulator on it.

That was unexpected. Also unexpected is the fact the circuit board is just not Central at all. Is it? Is it just glued in and randomly, what was that big huge blob of soda? This is not. Oh, is there wire coming through from the back? Uh, this is not made to a very high standard.

Nonetheless, let's take a picture of it and take a look at the circuitry one moment. Please, Reverse engineering is complete. Let's explore things worthy of note: The reason the circuit board is so screwed off center is because they've used uh, Bass that as a central hole, which is quite normal for the style of fitting. But because this circuit board has a whole off center, they've basically just squished over as far as they could and then glued it in place.

It's also worth mentioning that the inside of this is matte and The Outsider's gloss. Is that just coincidental? or is it something to do with light transmission? you know, perhaps absorbing the light from the inside and then emitting it well from the outside? Not really sure. It's also called White LEDs which is a bit of a shame because they don't really match the pink too well in the sense they could have made it more efficient, perhaps by using a warmer color. Let's take a look at the circuit board.

It's very simple. There's not even a fusible resistor as there often is at the back of these. everything is in the front of the circuit board. We've got the live in neutral coming on, and they pretty much go straight over to the bridge rectifier.

The output from the bridge rectifier goes to this capacitor which is a 2.2 megafar 400 volt death beam capacitor and then to this dedicated LED driver chip with an inductor 1521520s 1500 micro Henry switches. About 1.5 million, but it is 1.5 Milli Henry There is another tiny little capacitor, a very ungenerous one nanofarad capacitor there under 2.61 ohm sense resistor. This is the one that if you had one of these, and you wanted to hack it by increasing the value of that resistor, it should theoretically scale down the output current. Let's take a look at the actual data sheet for the manufacturer, which is quite handy.

Here is the data sheet from the manufacturer: There's the incoming Supply without those resistors ahead without resistor, the bridge rectifier, the 2.2 microfire capacitor going down to the chip, the positive goes out to the LEDs and the the measurable one nanopharic plaster. Crossing There's inductor, and there's the sense resistor. Now, normally I would expect a circuit like this to have what's called a Freewheel diode and the Freewheel diode would normally be mounted between. here.

Let me show you why. The way this works is that the chip will turn on its mosfet and current will start flowing through the LEDs but be limited by then doctrine of those are very small inductor. It's still significant at the frequencies of operation this operates at, so it will limit the current to a degree, but the current will gradually increase until it's sensed at a certain threshold by this 2.61 ohm resistor and the sort of voltage that develops across it then that will turn off. And normally what happens is that because this would say positive and air and it was being pulled down to negative when it's turned off, the field in that will collapse and this end will go positive and this integral negative and what happens there.

They usually have this Freewheel diode that actually diverts the current round so it's a very efficient and both the charging and collapsing of the magnetic field contributes to the LED current. Um. However, I got a meter hold on I'll do it right now I shall get the meter in right now. Let's put it to diode test under.

Though the datasheet did not show this at all, there is a diode between the positive pin and the output. Let me see if I can actually make a connection here. Let's see if I can even see if I can just screw this up completely I'm struggling to get connection on here. there is.

there's our diode. uh, 0.576 volts or so. Uh, that's a standard silicon diode. um, and that is inside here so that although it's not showing the drawing, I've just dropped the material though, it's not showing the drawing.

that diode is there and it's not even shown in the actual. the schematic in the date sheet that shows the rough block uh, system of the inside I Thought they'd have included that just to show it is not needed theoretically, but that is it. Note that this is a pin 7, but in reality it's an eight pin type chip. but pin 7 is completely missing, so they've just labeled that seven I Had to call that Penny because it's in position Penny But you know what? that's they call it the chips themselves and LEDs there are six LEDs There are two chip LEDs Uh, so 36 volts that differs greatly to the approach taken by many modern lamps that the bulk of the voltage is dropped across the LEDs and then it's a simple linear regulator that makes me think this is a much older style of circuit.

In if anything, it would be nice to see uh, the coverage is basically put on something like this and uh, that would be a much more efficient approach to doing it. Would be more modern if you will, but that's it. I Am disappointed, particularly given that they've used fairly standard LEDs that they didn't just use magenta LEDs where all the light output was in the color that matched the cap. That would have made it so much more efficient, but this is what we have, so it's an interesting little circuit.

It's neat enough. it's not really, it's not become my favorite lamp banished stretch imagination. it just has those little flaws that that rile me the most notably the over above the old-fashioned over complicated circuitry and not using the LEDs that match the color of the cover for maximum efficiency. They're just basically your generic cold fight for all the colors, but that is it.

The mystery pink lamp has now been explored and answers have been God.