Comparison of high-efficiency heat-dissipating COB LED fluorescent lamps and traditional fluorescent lamps

First, the experimental technical plan selection

Using LEDs to make semiconductor lighting applications, you can use different chips, different devices and different combinations and diverse structures, so don't rush to conclude that you can use a device, a chip, a combination or a The structure solves all applications, and it can not be considered that a certain kind of LED application luminaire can only use a certain scheme, so this provides a broad space for innovation in the design and production of LED lighting products.

Of course, whether the LED application results developed by certain technologies can enter the market and form a batch, depends on whether the product performance is excellent, whether the life is over, and whether the cost performance can start the market. For this we have compared four options as shown in Table 1. The use of φ5, φ3 in-line LEDs to produce fluorescent lamps has been a failure due to the thermal resistance of the device and the degradation of epoxy resin, and will not be discussed here.

Table 1 Comparison of various schemes of LED fluorescent lamps

Note: A is better B is better C is worse D is worse

It can be seen from the comparison in Table 1 that the indicators in Option 4 are excellent and the comprehensive evaluation is also the best. Due COB process scheme 4, a chip is directly mounted to the aluminum plate, than the previous embodiment can be omitted 1,2,3 structure and thermal contact resistance of the device, the system resistance can be reduced to a minimum, Reduce the junction temperature to improve light efficiency and illumination, extend life, improve uniformity, avoid glare, and reduce costs.

Second, the experimental steps and key points

1. A 30 cm long aluminum substrate is used as a die unit, and a blue chip, 64 pieces, gold wire bonding, and a YAG phosphor-containing silica gel are applied in a series and parallel combination to cure. The mold strip is mounted on the aluminum alloy profile frame, equipped with a driving circuit, and covered with a uniform light PC cover. The length of the LED fluorescent lamp is 120cm, 90cm, 60cm, and the diameter is T8.

2. Measure the luminous flux of the LED fluorescent lamp, the luminous efficiency, the illumination, the color temperature, the color rendering index, and the driving power efficiency on the light receiving surface of the specified distance and angle.

3. Life test: The luminous flux attenuation test is carried out with a normal working voltage of 220V.

Results: Two types of LED fluorescent lamps were developed, the models were T8C-Z164-9W and T8C-Z164-18W, and the basic parameters are listed in Table 2.

Table 2 High-efficiency heat-dissipating COB fluorescent lamp parameters

Comparison with the illumination of fluorescent lamps:

Tables 3 and 4 compare the set distance and the angle illuminance of T8C-Z164-9W with 60cm T8 fluorescent lamp (20W) and T8C-Z164-18W and 120cmT8 (40W), respectively. From the data, the lighting effect is the same, and the energy saving effect is remarkable.

Working life test: driving with normal working voltage of 220V AC, COB LED fluorescent tube diameter of 2100 hours, the luminous flux increased by 1% to 30cm COB die aging test has a similar situation, after 1600 hours, the luminous flux increased by 1%. A 3000 hour test is still in progress.

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