In 2014 it went on sale LED lamps on the COB. Submitted by the new technology, which allows the body to place a single LED and feed a lot of crystals. In the future, new technology will replace the existing SMD components.
On a common substrate placed crystals, which allows to give more heat and get more lumens per square centimeter area. By no reliable information from the Chinese, a single crystal on the substrate yields 5 lm, that is, the brightness is the same as that of SMD3528, 5050 at the cost of 3 crystal. Since it is essentially one large LED, and its internal crystal body are not required, it reduces the cost of 1 Lumen is about 2 times as compared with the older technology. COB matrix is coated with phosphor, thanks to him, he lit a single entity rather than a dot. Yet many do not require soldering SMD diodes soldered two wires luminaire ready. It also affects the cost price of lamps from China, because some nameless Chinese manufacturers manage to produce solder manually.
Disadvantages COB lampDisadvantages of the new generation of LEDs
COB LED has all the usual features of the previous generation. Technology allows them to any shape: rectangular, oval, round, with a hole in the middle that allows you to fit it in any lighting fixture or simply upgrade is available.
The larger the area — there is above its capacity, size 12 to 3 cm can already be used for street lighting. But in any case, do not forget about a good heat sink, heat has not been canceled.
New technology has brought new challenges to the operation of LED lamps for the home. Everyone knows how maintainable products SMD LED, repair is done in 5 minutes. Now COB failure requires replacement of the entire light emitting element, for example, not one of 42, as before. Over time, this lack will not be great, since the cost must be significantly reduced to such diodes. Now prices are too high because the novelty, and can be a good idea to invent pro specifications. Code all begin to understand this technology, the hype will drop to normal levels.
How to choose a COB LED bulb
New technology complicates the selection of products of unknown origin, especially the Chinese. When purchasing SMD bulbs on the diodes could be visible marking and then count the number of compute power, regardless of what is written in the characteristics.
In our case, photo and design will not know its power, because it is impossible to establish the consumption of COB LEDs in his appearance. Number, capacity, and crystal density may be completely arbitrary.
Probably, the situation with the Chinese COB will be the same as that of the SMD. Cheap Chinese LEDs include one-third of the nominal value for long-term service. In the case of BER, will probably be the same as the budget COB will also include 30% of capacity. If SMD mode can be determined by the number of elements, in this case the area would not be tied to the characteristics of the LED. Chinese online shopping will probably use it, gently inflating the luminous flux output. After all the normal buyer in most cases not be able to see it sold in branded lamp diodes or budget Chinese.
Test COB LED corn
The size and design are similar to corn 60 pieces SMD 5730 , but instead of brazed plate mounted COB. Exactly the same size produced lamps for the house on the SMD 5630.COB lamp 9 Watt
It costs $ 9 per share, the price is certainly exaggerated, like a SMD 5730 worth $ 6, similar to the SMD 5050 a bit cheaper, but had to buy for the sake of interest. The seller promised:
- power supply 220V;
- consumption of 32 mA;
- warm white;
- Power 9 W;
- luminous flux 800-900 lm.
Brightness compared with new energy-saving Philips 800 lm, the same brightness, light and shade. The chandelier on the picture is the two new and two fluorescent. Brightness Chinese COB up to 100 lumens per watt, as in our case.
Meals made in the ballast capacitor, but the soldered additional capacitor to reduce the flicker factor. Flicker is present, but it is not as strong as that of other low-cost, that is within the normal range. The bulb is heated, but not too hot, the area of the side of the circle still considerable, within the allowable temperature.
Testing has shown that it meets the specs, sufficient good quality, defects in the assembly is not found.
New technology shows good characteristics, the brightness is already up to 120 lumens per watt, instead of the previous 80 lumens per watt. But do not rush to buy, prices are too high for them, such as using nanotechnology and Hadron Collider. Their price should fall below the cost of the lamps on the SMD components.