October 22, 2020

7 brand COB package light source product depth evaluation

The heat dissipation performance of lamps often becomes the decisive factor for light quality and lighting stability. As early as the birth of COB package, it is generally favored by the industry because of its high luminous efficiency, low light decay and good heat dissipation. Nowadays, COB packaging Revolutionary progress has been achieved, breaking through various technical bottlenecks. Representatives from various companies and industry engineers in May this year clearly stated that the current COB package is fully mature at the technical level. COB packaged light sources have gained a place in commercial lighting due to their cost-effective, relatively low thermal resistance and heat dissipation relative to SMD. Philips, Osram and other companies that started with high-power applications have gradually begun to exert their power on small and medium-sized power applications.
Based on the superiority of its heat dissipation, a group of packaging companies began to press the heavyweight on the COB package. At present, many domestic packaging companies have achieved mass production, but the stable and reliable COB package light source is still rare. The COB package is an integrated surface light source that directly attaches the chip to the mirror metal, and is a series connection of a plurality of chips with different structures. This packaging technology requires higher requirements for a single chip, and the stability and reliability of the entire light source are more difficult to control.
So, what is the performance of COB package in terms of light efficiency, light decay, heat dissipation and reliability?
At present, COB packaging has relatively large shipments in the small and medium power applications market, and applications are also extensive. In this evaluation, the sample power has been selected in the relatively more representative range of the application market: 8-10W, and invites the representative enterprises of COB packaging in the industry: Assembling Optoelectronics, Jingke Electronics, Cree, Tongfang Optoelectronics, Hongli Optoelectronics, Addison, Citizen.
Due to the objective facts that the products and technologies produced by the company are different, it is difficult to completely unify the sample specifications such as power and size. The evaluation number of this period did not include the application scenario of the sample in the scope of the evaluation, so the color temperature of the sample was not clearly defined.
Sample introduction
Which is the COB package? 7 brand COB products in-depth evaluation
Note: The power value of the sample in Table 1 is the rated power provided in the sample specification.
Ascending cob
#1升谱sample (G17-303H0312-1811MA)
Jingke COB
#2晶科样(EP09-W8)
Cree COB
#3科锐sample (CXA1512-40F-N2-NOH-00003)
Same party COB
#4同方sample (PR2345)
Hongli COB
#5鸿利sample (HL-LM002H384W-7B3C12)
Edison COB
#6 Edison Sample (HM09)
Edison COB
#7西铁城样(ZM-RC1430K0902-R8M-9W)
Test equipment and test conditions
Photoelectric characteristics:
Product Evaluation PRODUCT REVIEWS uses a remote PMS-80 spectral analysis system with a 2m integrating sphere (Figure 9) to measure the photoelectric parameters at room temperature.
Figure 9
Use the probe station with a 150mm integrating sphere (Figure 10) and the InstrumentSystem CAS-140CT spectral analysis system (Figure 11) to measure the photoelectric parameters at different temperatures on the probe station.
Figure 10
Figure 11
Thermal characteristics:
Thermal characteristics were measured using a MicRed T3Ster® system (Figure 12).
Figure 12
Experimental setup: The laboratory ambient temperature is 25 °C, and the relative humidity is 40% to 60%. The sample is attached to the surface of the 20W heat sink for testing in Figure 13; both use 1800 s heating time and 1800 s test time.
Figure 13
Light distribution characteristics:
Use the source near-field goniophotometer Source Imaging Go niometer (SIG-400) (Figure 14) to measure the near-field optical distribution, and import the generated light source file into Tracepro for simulation to obtain the light distribution characteristics (lighting angle and light distribution curve). .
Figure 14
Aging characteristics:
The high temperature aging test was carried out using a high temperature oven JX-2220B and an IPD-20001 SLU constant current power supply (Fig. 15).
Test conditions: Temperature: 85 ° C; aging time: 168 h; drive: sample rated constant current drive.
Figure 15
Note: If the evaluation data in the report is not specified, it is the test data before the aging test.

Photoelectric characteristics

Photoelectric parameters before aging test:

Photoelectric characteristics of the probe platform at different temperatures Test conditions: test temperature range: 25 ° C ~ 85 ° C; temperature interval: 15 ° C measurement electro-optic characteristics include: luminous flux, voltage, color temperature, color coordinates.

Analysis content: the attenuation of the luminous flux with the temperature of the probe platform; the deviation of the voltage with the temperature of the probe platform; the deviation of the color temperature with the temperature of the probe platform; the deviation of the color coordinate with the temperature of the probe platform Happening.

Which is the COB package? 7 brand COB products in-depth evaluation

Attenuation of luminous flux with increasing probe platform temperature

Analysis: The light flux of Jingke's sample decreases with the increase of platform temperature, and the luminous flux of Citizen's sample decreases with the increase of platform temperature.

Which is the COB package? 7 brand COB products in-depth evaluation

The voltage shifts with the probe platform temperature

Analysis: The sample voltage of Citizen is the smallest offset from the rise of the platform temperature, and the sample voltage of the up-sampling is the largest offset with the increase of the platform temperature.

Which is the COB package? 7 brand COB products in-depth evaluation

The shift of color temperature with probe platform temperature

Analysis: Edison's sample color temperature has the smallest deviation from the rise of the platform temperature, and the color temperature of the same sample is the largest offset with the increase of the platform temperature.

Which is the COB package? 7 brand COB products in-depth evaluation

Offset of color coordinates as a function of probe platform temperature

Analysis: For the color coordinate x, the sample of Edison has the smallest deviation from the rise of the platform temperature, and the offset of the same sample is the largest; for the color coordinate y, the sample of the ascending spectrum has the smallest deviation from the rise of the platform temperature. The sample deviation is the largest.

Light distribution characteristics

Which is the COB package? 7 brand COB products in-depth evaluation

Light distribution curve - up to 170 degrees

Which is the COB package? 7 brand COB products in-depth evaluation

Light distribution curve - Jingke illumination angle 116 degrees

Which is the COB package? 7 brand COB products in-depth evaluation

Light distribution curve - Cree illumination angle 116 degrees

Which is the COB package? 7 brand COB products in-depth evaluation

Light distribution curve - the same side illumination angle of 120 degrees

Which is the COB package? 7 brand COB products in-depth evaluation

Light distribution curve - Hongli illumination angle 120 degrees

Which is the COB package? 7 brand COB products in-depth evaluation

Light distribution curve - Edison's illumination angle of 118 degrees

Which is the COB package? 7 brand COB products in-depth evaluation

Light distribution curve - Citizen illumination angle 116 degrees

Thermal characteristics

Thermal characteristics of 7 COB modules:

Analysis: Among the COB samples of each manufacturer, the lowest thermal resistance is the same sample, 0.7K/W; the highest is Citizen sample, 4.5 K/W. In terms of junction temperature, because the current magnitude directly affects the junction temperature, the comparison junction temperature is not significant under different test currents, but the junction temperature is the lowest in each sample because the thermal resistance is small, which is 44.0 °C.

Electric Water Kettle

If you are new to the concept of using an electric kettle, you might be overwhelmed by the variety of electric kettles that are displayed on the store shelves and have difficulty deciding which one would be the best to suit your individual needs or desires.  This introduction will give you some basic information about some of the features that are available on various types of electric kettles so that you can make a more informed decision when choosing one for use in your home.

 

Features:

 

Spend few minutes to boil : After 5 minutes, hot water will finish for you to drink.

 

3 protection functions : The on/off button is on the handle, making it easy to turn the kettle off when you pick it up.  A concealed heating unit reduces the amount of buildup in the kettle.

It will be a problem when you forget to close the button.Once the water boils the kettle shuts itself off.Do not have to worry about damaging it by letting it run dry. When water runs dry,It will cut the electric by itself.

 

Multiple Cups: Water can be loaded to 1.8Liter.

 

Materials :

Food grade stainless steel, more healthy and hygienic. PP handle wieh heat insulation material provides scald resistance. Durable controller performance with 360 degree rotation cordless base design.

 

OEM & ODM service : Try best to support you during production and provide better after-sales service.Enhance your brand popularity.

 

Application:

Make a cup of tea.

Boil eggs.

Cook noodles.

Electric Water Kettle

Electric Water Kettle,Aluminium Electric Water Kettle,Mini Electric Water Kettle,Stainless Steel Electric Water Kettle

Guangzhou Taipeng Electrical Appliances Technology CO., LTD. , https://www.taipengelectric.com