The whole truth about filament LED lamps - we disassemble and measure with a wattmeter and a heart rate monitor

The whole truth about filament LED lamps - we disassemble and measure with a wattmeter and a heart rate monitor

A lot of questions around, strange (at firstlook), lamps. At work, I often encounter lighting and this is not the first time I have been comparing lamps. This time my hands fell on products under the Feron brand. And in this case, these are the so-called “filament” lamps - which have recently become increasingly popular. I have been using them for some time, and so I decided to share my experience of using it with you. I will explain what it is and why they are needed. And all the detailed parameters and current prices are you, in which I bought them. Content

    Consider filaments in four popular flasks

    Model size A60 (written on the packaging60x107mm). This is the standard size for pear shaped lamps. A60 is most often sold with the E27 base. We have a 7 W lamp (an analogue of a 60 W incandescent lamp) and a natural white glow with a luminous flux of 760 Lumen under our guns. Feron produces these lamps in 3 colors - these are:

  • warm white
  • neutral white
  • and daylight white - such a cold 6400k - close to xenon light.
  • In this case, it is a neutral white light bulb with a declared power of 7W and an operating voltage of 230V. The seller in the online store said that you needlook at the fact that the manufacturer indicated 230V. Only they are suitable according to GOST. If 220V is indicated, then a surge in the network in plus or minus 10% can lead to burnout. So be sure to look at the voltagenutrition. For clarity, if you, like me, have such a wattmeter with a voltage measurement function, you can measure your bulbs. Measuring, we see: our 226.6V (even plus or minus 10%) is within the normal range. The dispersion angle they claimed is 270 degrees,but in fact I would say that it’s not 270 degrees, but at least 300 degrees. A service life of 30,000 can also be considered not an overestimated parameter, this is the real life of most LEDs.

    In general, what is filament?

    We are used to everything on sale, arranged onSMD diodes. Initial lamps on DIP diodes have long been obsolete, because not effective - they are already difficult to find Now the most popular are in the form of pears, candles, balls, gx53 tablets - they all mainly go on SMD diodes 2835, 5730, 5630 type. And even there are already lamps on COB diodes - these are chips withvery tight installation for the manufacture of mainly miniature lamps G4 and G9. As well as MR16 and other directional lamps. There is no big reason to make pears on COB technology, since COB LEDs have a very small scattering angle - only 120 degrees. Therefore, on the basis of such LEDs, light sources (lamps, lamps) of precisely directional light, such as spotlights, are made. And if you need diffused light, then go outposition using SMD diodes, placing them on the matrix in one plane, which is attached to the radiator for heat removal. And the light is scattered by a matte bulb. But anyway, in any case, the scattering angle is much worse than that of the filament ones - somewhere around 180 degrees, or even less. The advantage of this technology is that it allows you to remove heat well. Especially if a good radiator is used in the design. Some other manufacturers are trying to get out of the situation by increasing the scope of the matte diffuser (plastic bulb) in order to increase the scattering angle itself. That's just in such LED lamps, the angle is close to270 degrees. But, in any case, due to the matte diffuser, the lamp efficiency is reduced, because part of the light is lost in this very diffuser. In order to get away from this “loss of light”, such filaments were invented here. They use filamentous LED arrays. This is not one LED, but a type of COB technology, only here it is called COG (Chip on Glass). In COG, LEDs are sprouted onto the glass base and covered with a phosphor (which just glows with a particular glow color). In order to remove the heat of these filamentaryLEDs, gas is injected inside (in fact, it must be pumped by technology), based on helium. Here it has good thermal conductivity and fluidity. He inside there due to convection, he removes heat from the LEDs to the glass bulb, and that already gives off to the environment. So, the power of filament lamps is limited by the capacity of this bulb, and how much gas can be pumped there. Therefore, it is impossible to put there 20-30 of these LED threads. Yes, theoretically they will shine, but not for long, because quickly overheat and fail. Therefore, like classic LED lamps, filament lamps are limited in power. It is impossible to realize 20W in a small bulb, but usually 5-7W. The maximum that I met was 18W in the A60 bulb of LEDeX, and then with the use of a good radiator. So, in principle, for the long-term lamp life, it will not be possible to realize more power. So in the filament, the lamp power is limited by the size, or rather the capacity of the bulb. For example, Feron claim to have implemented onThis lamp is 7W. But as far as I have come across these lamps, on average, the power of one thread is about 1W. Accordingly, if there are four threads, then 4 watts. But each manufacturer has different components and maybe in one thread there can certainly be more than 1W. But it is very simple to measure. There are no miracles here, and it is not 7 watts. As I suspected, 3-4 Watt is such an actual power. As you can see, it’s easy enough to estimate the power with these lamps: just see how many threads she has. And remember: one thread consumes about 1W. In addition, the ripple coefficient is about 25%, andit is, in any case, more than sanitary standards. Therefore, for domestic use at home, I probably would not use such a lamp. From the pros: the lamp does not heat up, and literally a little warm. Although 4W ... of course, why would it heat up. And an ordinary 4W LED lamp will hardly warm up. But the efficiency of the filament lamp is higher. Now they are of course more expensive than usual on traditional SMD diodes. Especially the difference is felt in a row with cheaper lamps on the so-called composite radiators. There is a radiator somewhere, but not somewhere. So why does it make sense to buy such filament bulbs? Lamps with such a filamentous LED are perfect for crystal lamps and chandeliers. Because for crystal lights it’s important,this effect is to let the light play on the verge of crystal. And with a matt source, crystal chandeliers will not overflow. Well, then, since the efficiency of such a lamp is better, it scatters the light better. And where you need exactly a good angle of dispersion, such filaments are best suited.

    Where to buy

    Prices on the screenshot from the official site of the representative of Feron - AxiomPlus online store. Actual prices for today, in principle, you can go and see for yourself .. Well, all this is understandable and the case is being made in China. And the analogs on Aliexpress, however, are much cheaper, but purchases in China have their own characteristics. Let's not talk about them. I think you already know everything.

    The second example is a lamp in a bulb G45

    Let's look at another example of a lamp - a smaller one - in the shape of a ball, the so-called G45 with a corresponding bulb diameter of 45mm. Here they already claim that it is 5W. The basement they have is both e27 and e14 (small). There are four strands, which means we can assume that here everything is all right and 4W. The color of the glow is also natural - neutral white 4200 Kelvin. Measuring on a wattmeter, it can be seen that here tooabout 4 watts, more precisely 3.8 watts. The ripple is slightly less, and about 9 percent. But 10% is also a lot. Must be less than 5%. As you can see here, unlike the matte bulb, everything is transparent and looks exactly like an incandescent lamp. The driver seems to be hidden in the base itself, and later on I will show one of the lamps in a disassembled form and you will see how it is implemented. In this small volume, it’s hard enough to fit a good driver with a good filter. So that he smooths out these ripples. Here the driver is made to a minimum just to shine, everything turned on.

    The third lamp in the form of a candle - C37

    Next to the court is a candle with a socle e14 and5W power. Here, as in the ball, the same number of threads, but it is made in the form of a candle. For a candle, the main dimensional parameter is the diameter, because often they must fully fit into the design of a chandelier or lamp. And according to the standard, this diameter should not exceed 37mm. Here, even a little less - they made it 35x110 mm. There is already an extra skirt on the candle, whichthe driver hides itself more seriously. But on the one hand, this skirt closes the angle of dispersion and reduces it. Already there are no those 300 degrees, like the first, but a little less. But on the other hand, this allows you to install the lamp in a chandelier with "glasses", in which not every candle-shaped lamp will fit due to the width. She gets there perfect and is normally fixed. We will not consider the sizes in detail, because For us it is important now to match power and ripple. And here with the power the same as with the ball was: 3.6 W instead of 5 W declared. But the ripple coefficient, apparently due to the larger driver in the "silver cup", is just normal - 0.5-2.0%. These lamps are good, practically without ripple. Because a good driver will not fit in the e14 base. And in this “glass” the manufacturer was able to additionally fit a filter to smooth out ripples. So such a lamp LB55 is very good. For example, we have LB55 with a temperature of 4000Kelvin, but also like the others are available: warm, neutral white and daylight white in three color options. So you can choose a color for your taste that you like more warmly or colder.

    And the fourth light is a candle in the wind

    The same Feron, but the truth is now warm and shecomes under the name like a candle in the wind. Many people think that this is a flickering candle with light like a real candle in the wind. But no, it's just a flask supplemented with a tail, which shines exactly the same even light as an ordinary one. In size, it is usually a little bit longer. We will not measure it, and on the box it can be seen that the dimensions are 110mm and 142mm, respectively (due to the tail). And the diameter is the same. The driver inside is also better and the lamp is shiningone to one, like incandescent. The power is the same 3.8W, the ripple coefficient within the normal range is 1%. Let me remind you that everything up to 5% is not bad, and very good. So the lamps seem to be of the same manufacturer, but they are so different (I mean by ripple and by power indicators). So some were with clearly overestimated declared performance of 7W, where it really was 4W. So focus on the number of threads. One thread - 1W, approximately.

    What is inside the LED lamp?

    Take an old lamp, one of the blown. She stated exactly 10W power and she most likely overheated and burned out in this flask. Many marketers have now begun the trend of "more and more declared power." More and more threads begin to shove into a small flask. At first there were eight-thread 4-8 watts, it was still normal. And now they are throwing on the market lamps of the same size, but with 10W on board. In them, "stopudovo" is either less power, or it will burn out just as quickly. Even 8W for an A60-shaped filament lamp is already the limit. It starts to overheat and can fail quickly enough, especially if you have it in a closed lamp. Or what's more, in some kind of hermetic lamp where there is no cooling. And it is the same LED, and also demanding for cooling. So it happened with my old lamp, which, I think, still gave out about 9W, which led to the fact that it overheated. Another way to check the light bulb is to break it. If there is gas (and it should be), then there should be a characteristic cotton, like an incandescent lamp. True, there was a vacuum in them or there was some kind of inert gas based on helium. As a last resort, if you do not hear cotton, then a specific smell should be present. But in general, this moment remains on the conscience of the manufacturer, since you won’t begin to beat bulbs directly in the store. In principle, everything that is located inside is visible,capacitors and a pulse transformer which in all lamps are involved in smoothing ripples. If these details are not there, then the ripple in the lamp will accordingly be frantic. In general, such lamps need a competent approach to choosing and buying. You should not mindlessly buy some new-fangled bulbs. They are of different quality from different manufacturers. They also fail, can burn out, and ripple can also be present in them. And do not believe the stories that LED lamps do not burn out, do not pulsate like fluorescent, and in general it is a panacea.

    Differences between modern and old lamps

    The first models were quite expensive, becausefilamentous LEDs were grown not on a glass substrate, but on a sapphire. And the very first models were as an exclusive solution and quite expensive. Now the number of producers has increased, competition in the market is increasing, and accordingly, the technology with growing on a glass substrate has already been developed, so that the cost of filaments continues. Prepared using materials from the online lighting store AksiomPlus Anatoly Bezdymny Do you like this article? Share on social networks!