Powerful LEDs, characteristics. Powerful LEDs, characteristics High-quality 100 watt LED
It all started with the fact that I saw in group purchases a lot of selling 100 watts of LED at a big discount. I really love these toys, so I could not resist.
To be honest, I did not plan to post this review, but after a little holivar in my review of defective 10 watt matrices, where it was suggested that when viewed through dark glass, I simply do not see that the rest of the crystals also work, I decided to show here that If the LED is working, then everything should be fine to see.
So actually the review - the LED module came in a package made in the style of late minimalism. The envelope has the color Cheap Cardboard. However, it all started not with this, but with the fact that in the evening I passed by the post office and knowing that the order was planned to arrive, I decided to pick it up, but they told me that the parcel had not arrived yet.
What was my surprise when, in the morning, updating the status of orders, I saw that the parcel had been delivered to the addressee, moreover, yesterday and before my arrival. Having dressed and already in the mood to swear, I looked into the mailbox on the way and noticed an envelope with an order there. I printed it out at home and saw this picture -
Of course, I like the quality of our mail (I hope they don’t read this, otherwise they will work worse), but I was surprised how the order arrived intact, the envelope was pasted over with a bubble wrap inside, but it would hardly help if something more or less fell from above heavy.
I decided to take a picture next to a 10 watt LED for size comparison.
By the way, the dimensions are 40-45 mm. (excluding contacts), the dimensions of the actual matrix are about 25x25 mm.
The first thing that surprised me was the weight of the LED. He is light. The mass of the LED is 11 grams.
For comparison, 10 watt LED:
The second surprise is the marking, take a closer look and try to guess where it has + and where it has -.
On the case, plus is marked at the top, minus at the bottom, contacts on the sides.
Trial switching on, this time I had to use a C-8 class filter, since the camera was overexposed on C-4.
To my surprise, everything works, in the photo the current is 1.6 Amperes, the voltage on the matrix is \u200b\u200b33 Volts, the power is about 53 Watts. Unfortunately, my regulated power supply has insufficient voltage, so I had to improvise. A transformer with a power of about 60 watts with an output voltage of 38 volts was taken, then a diode bridge, a battery of capacitors with a total capacity of 5000 μF and a current-limiting resistor (three in parallel, 10 ohms each), the resulting current is indicated above.
The matrix, of course, has a small spread in the parameters of the LEDs, which appears only after the power is turned off, on the residual charge of the capacitors.
But as it was seen before, everything is fine at the working current. By the way, here you can see that for some reason the chains of LEDs are placed across the usual arrangement, the meaning of such a creative is incomprehensible to me.
Unfortunately, this is not a light bulb and it is problematic to evaluate the brightness, but it feels approximately equal to 80 watts of luminescent light (with 53 watts on the matrix). That is, if you put an LED and a luminescent lamp next to it on the table, it will be approximately similar in terms of the level of light in the room (sometimes they bring office 4x18 for repair or alteration).
Photo included desk lamp with 35 watts of halogen, and 240 volts in the network.
In reality, the light looks brighter and less blue, although the matrix is listed as cold white, in reality it’s not so scary, I thought it would be worse. I apologize for the mess on the table, the consequences of searching for a power option for this matrix.
Pros:
it works:)
the whole matrix is correct
the light is quite tolerable
Minuses:
poor packaging
strange heat spreader material
Summary: it’s quite possible to take it for irresponsible applications, I was embarrassed by the moment with a suspicious heat spreader material (too light), but at half power it easily warmed up the radiator for me from the processor (for 2-3 minutes of a photo shoot and a few short turns on with pauses before that, the radiator warmed up about up to 55 degrees, I didn’t measure it more precisely) despite the fact that it would have been burned only at KPT-8, and about 60% was covered (mostly everything in the center) and was not pressed with screws. Therefore, the heat transfer of the body material is very good. Given the low price (at the time of purchase it was 5.39, now 8.99) it’s definitely not bad, only now it needs a design (case, radiator, reflector, driver).
Many of you have seen the difference in prices in domestic and Chinese online stores for high-power LEDs. A 50W model in China costs 100 rubles, in Russia 500 rubles. Outwardly, they are similar, power consumption is the same, no differences are visible.
In fact, there are many technical characteristics that the Chinese use to make LED as cheap as possible. At the same time, both quality and parameters suffer greatly. But for a bad and cheap diode, they don’t write real parameters, they indicate from high-quality LEDs. Usually they write the same standard 50.000 hours. service, the same power. Only 100W, 50W, 30W, 20W, 10W super bright white light LEDs will be considered. Infrared IR, UV UV, RGB will participate in separate reviews and tests.
- 1. Size
- 2. Parameters of Superbright LEDs
- 3. Characteristics from the Chinese
- 4. Specification example from Bridgelux
- 5. Price
- 6. Scatter of parameters
- 7. Base material
- 8. Conductors
- 9. The most powerful
- 10. Lenses for optics
The size
Sometimes the seller in the specifications for LEDs 10 W, 20 W, 30 W, 50 W, 100 W writes the size of the crystals used, in units of "mil". This is a unit of measurement equal to one thousandth of an inch, or 0.0254 millimeters. To check the seller for honesty, you can measure the size of the crystals with a micrometer. Only a complete disassembly is required with the dismantling of the silicone coating, the removal of the phosphor layer.
LED matrices consist of standard 1 watt crystals, which are placed with single-wool in the Emitter package. Standard chip dimensions are 30*30mil and 45*45mil, in millimeters 0.762*0.762mm and 1.143*1.143mm. Rated current 300mA.
The exception is the 10W LED, it has 9 of them. Another one was added by marketers to increase sales.
Parameters of Superbright LEDs
To reduce the cost, the Chinese decided to put smaller and worse crystals on 10W, 20W, 30W, 50W, 100W by 0.5W and 0.75W, for which the rated current is 150mA and 220mA. For them, 300mA will be too much, they will degrade and heat up a lot. Good crystals should be between 30*30mil and 45*45mil.
Correspondence of sizes and power:
- 1W=45*45mil;
- 1W=30*30mil;
- 0.75W=24*40mil;
- 0.5W=24*24mil.
- 0.5W=20*20mil for SMD5730
Bridgelux, Epistar, Epileds
Characteristics from the Chinese
A caring seller places a table with the parameters of LED matrices on the product page. If these data are not indicated, then I do not advise buying in this place, there may be a large variation in quality.
In the table for 24*24mil, you can see that the seller indicates the standard power of 10W, 20W, 30W, 50W, 70W, 100W and the number of crystals installed. Pay close attention to voltage and current. For 100W, the number of volts is 30-32V, Ampere 2-2.1A.
We calculate the power for24*24mil:
- minimum 30V*2A = 60W;
- maximum 32V * 2.1A = 67.2W;
- that is, instead of the promised 100W, it will be 60-65W.
The value of 60-65W is still too high, since 1 chip per 0.5W, then it’s really 50W there, but they sold it to us as 100W. Crystals are already the cheapest and worst, so any overclocking is contraindicated for them.
Calculate for24*44mil:
- minimum 30V * 2.850A = 85.5W;
- maximum 32V * 3A = 96W;
- the average will be 90W.
According to the table, we got 90W, in reality there is 75W, they overestimated it by 15W.
Let's count for 30*30mil:
- minimum 32V * 2.8A = 89.6W
- maximum 34V * 3.5A = 119W
- average 105W
Size 30*30mil provides the promised specifications. The same chips are placed in ordinary high-quality single-wool 1W with a power consumption of 10W, 20W, 30W, 50W, 70W, 100W
Specification example from Bridgelux
I will show the characteristics of powerful LED COB matrices from world manufacturers. Use this table to compare with budget ones. The luminous flux depends on the color temperature, the higher it is, the better the Lumens per Watt efficiency. It also depends on the color rendering index, with CRI70 the light output index is up to 128 lm / watt.
The difference in these parameters for the same power, for example 50W, is:
- CRI90, 2700K, 50W = 80lm/W;
- CRI70, 5600K, 50W = 128lm/W;
- 128lm/w - 80lm/w = 48lm/w difference, or 60%.
Price
The most interesting thing remains, this is the price of such products for 10W, 20W, 30W, 50W, 100W. I will indicate the prices in rubles for which I bought. As you can see the price differs by 3-4 times. When buying cheap junk, do not hope for a miracle that you will be lucky and get a good one. the only way to long-term operation is to use an underestimated current. In this way, active degradation and excessive heating can be avoided.
| Energy consumption | 24*24mil | 24*44mil | 30*30mil |
| 10W | 33 rub. | 20 rub. | 129 rub. |
| 20W | 78 | 63 | 226 |
| 30W | 98 | 82 | 278 |
| 50W | 131 | 107 | 302 |
| 70W | 150 | — | |
| 100W | 205 | 121 rub. | 453 |
Such chips can be heated to a maximum of 60 ° and this is the temperature of the crystal, not the case. The critical will be 70°. For powerful branded ones, heating is allowed up to 110 °, for the highest quality and most expensive ones up to 150 °.
The luminous flux, of course, they are decently overpriced, the Chinese promises 100 lm / watt. Really happens from 60 to 80lm/w. For a quality branded one, this indicator is 105-120 lm / watt.
This information can be used to return money for the goods. You were deceived if the real power is 2 times less. We open a dispute on Aliexpress and ask for a refund of half the amount. Two weeks ago I bought such diodes for 2000 rubles. Soon they will come and I will ask for damages for deceit.
Scatter of parameters
Cheap LED chips for 10, 20, 50, 100 watts can have quite large differences in parameters. Because of this, some of the chips will heat up and degrade more, respectively, they will fail faster. To check, turn on at a very low current so that they glow a little. Visually, you will see that some crystals shine strongly, while others do not.
Base material
To reduce the cost, the Chinese use aluminum or its alloys as the base material. For quality, copper is used, which has better thermal conductivity. Therefore, a high-quality powerful LED should weigh 2-3 more than a cheap one.
conductors
To connect the crystals to the contacts, thin threads are used in an amount of 2 to 4 pieces. And here you can save money by replacing 4 gold threads with copper ones or reducing the number to 2 pieces. Another option is a copper thread covered with gold on top, it is very difficult to find the difference.
They are responsible for the current strength at which the diode can operate. They are made with a margin to withstand power surges and not burn out. There are fewer of them on budget matrices or they are made of copper.
Some of you have already experienced a similar phenomenon with LED position lamps. A Chinese light bulb with a power stabilizer will work less hours than a lamp on branded diodes without a stabilizer. The brand has high-quality conductors that withstand surges in car network, which are up to 30V.
The most powerful
In addition to the common ones for 10 watts, 20 watts, 30 watts, 50 watts, 100 watts, there are also the most powerful LEDs for 150W, 300W, 500W. According to the results of testing, the luminous flux in the presence of optics on a 500-watt diode melts snow at a distance of several meters. Thanks to big size installed crystals, very fat and heated photons fly out of them.
Lenses for optics
When manufacturing LED spotlights and fixtures, the most difficult thing is to find the right housing that will focus, protect, cool. Usually a radiator and a driver are available as the basis of the design. One of the most simple ways close a powerful LED and focus its light flux, this is the installation of a collimator lens. The kit consists of a chrome frame, reflector and lens. Light focusing can be from 5° to 90°. It is enough to fix the LED on any radiator and close it from above. It will be completely protected from external influences, suddenly the crows will peck it out.
The scope of high-power LEDs has expanded significantly in recent years. Currently, high-power LEDs are already successfully used in transport, in the automotive industry, where LEDs have been introduced into parking lights, brake lights, and other lamps of modern cars. The rapid development of high-power LED production technologies has allowed LED devices to enter the field of lighting technology, and there is no doubt that high-power LEDs will soon completely replace obsolete light sources, including energy-saving lamps.It can be seen from the figure that LEDs with a power of tens of watts are not a single crystal, but are an LED matrix, an assembly of dozens of individual LED elements of low power (about 1 watt) located on one substrate.
The development of LED technology in recent months has led to the emergence of new efficient 100W LEDs. Powered by a source of 30-40V and current up to 5A. Naturally, such modes require good cooling, and the radiator becomes an integral part of high-power LEDs.
It is these powerful LEDs that are intended for use in lighting. In terms of luminous flux, luminous efficacy, color rendering index and reliability, they are already superior to traditional light sources used in lighting fixtures. The use of powerful 100W LED fixtures in lighting looks very promising, and will lead to payback of initial costs due to energy savings and reduced maintenance costs. Powerful 100W LEDs, firstly, they have directional radiation, and there is no need to use reflectors, which avoids reflection losses, and secondly, the LED manufacturing technology has advanced to such a level that the luminous efficiency of a white LED is the highest among all artificial sources Sveta.
Summing up the features and benefits of high-power 100W LEDs, we note the following points:
Lighting fixtures based on LEDs consume 5 times less energy than fixtures based on fluorescent lamps and incandescent lamps.
LEDs are ideal for working in difficult temperature conditions.
The service life of LEDs is up to 100,000 hours.
Due to their small dimensions, LEDs can be placed inside a device of any shape.
LEDs are available in many colors with different shades of emitted light.
LED illuminators allow you to dynamically change the shade of light without additional light filters.
The response time of the LED to changes in the supply voltage is measured in microseconds.
