Color temperature

LED Color Temperature

The Nature of light is different, and the perceptible color of an object depends on the light source. The human brain can “correct” these color changes very well, but the film or CCD/CMOS photoreceptor we use cannot accomplish this task.

Color temperature

If an object burns, first the flame is red, as the temperature rises then it becomes orange-yellow, then it becomes white, and finally, blue appears.

Scottish mathematician and physicist Lord Kelvin first discovered the close relationship between heat and color in 1848, and left the world a great concept of “absolute zero” (-273.15 degrees Celsius). Since then, the Kelvin temperature scale was created. This is the theoretical basis for our discussion of color temperature today.

The Kelvin temperature scale uses K (abbreviation for kelvin) to express temperature. Take the flame as an example here, the lower value means the more “red”, the higher value means the “blue”. Red and blue are not the colors of light itself, but just show that there are more red or blue components in the spectrum.

 

Let’s take a look at the common standards in the Kelvin temperature scale: “Absolute zero” is expressed as 0 K in the Kelvin temperature scale, which corresponds to -273.15 degrees Celsius (or -459 degrees Fahrenheit). At this temperature, the thermal activity of the substance stops completely.

The more bluish the light color get, the higher the color temperature is ; the more reddish the light color has, the lower the color temperature get. The color temperature of the light source is different, and the light color is also different. The color temperature below 3300K has a stable atmosphere and a warm feeling; the color temperature is between 3000-5000K as the intermediate color temperature, which has a refreshing feeling; the color temperature above 5000K has a cold feeling. Different light colors of different light sources make up the best environment.

The preference for color temperature varies from person to person, which is related to the scenery we see daily. For example, in areas close to the equator, the average color temperature that people see daily is 11000K (8000K (dusk) ~ 17000K (noon)), so they prefer high color temperature (it looks more real). On the contrary, people in higher latitudes (the average color temperature is about 6000K) prefer low color temperature (5600K or 6500K), which means that if you use a high color temperature TV to show the Arctic scenery, it looks like It is bluish; on the contrary, if you use a low color temperature TV to watch the subtropical style, you will feel a little reddish.

led strip light

How is the color temperature of a TV or display defined? Since the average color temperature of China’s scenery is between 8000K and 9500K throughout the year, TV programs are produced with the audience’s color temperature of 9300K for photography. However, the usual color temperature in Europe and the United States is different from ours. The production reference is based on the average color temperature of about 6000K throughout the year. Therefore, when we watch foreign films, we will find that 5600K~6500K are the most suitable for viewing.

 

 

People with black eyes see 9300K as white, but people with blue eyes see a blue tint. At 6500K, people with blue eyes see white, while people with black eyes see yellowish colors.

led strip quality

7 way to judge LED Strip Quality

7 ways to judge LED Strip quality

home

 

As the LED competition, The different quality of Led strips are flooded in the LED Market. The high quality of LED  light strips is relatively more expensive than the economy ones’. If you judge the quality of strips from the professional technology, I am afraid that not all customers are in a position to do that. However, we could identify the quality from the following points.

 

 

 1. Solder Joint

Professional LED light Strip Manufacturer produce the strips with SMT Technology and Reflowing soldering machines. Therefore,  the LED solder joints look smooth and nice.

 2. LED Quality

LED Quality is the Top consideration of LED Light strip. many qualities are flooded with the whole led market. It has iron package, alloy wire package and gold wire package. it has something to do with the LED working life. If the LED adopt iron package, then the working life is very short but cheap is very cheap. On the contrary, Gold wire led package is best and highest, stable quality can last the LED’s working life. more than 50000 working hours.

3. FPC quality

FPC have two quality versions. one is Copper FPC and another one is Rolled  Copper FPC. The Rolled Copper FPC are more expensive and the quality is better than the copper FPC. It is connected to FPC as a single entity, and it can be bent, and the solder joints still look good; so the copper foil of the sub cooper FPC is pro tuber. it could be seen from the connection between FPC and the tin plate. moreover, the Sub copper FPC are bent over  much, it will cause the tin pad off.

4. Wire quality

5. Surface cleanliness

Generally speaking, The flexible strip tapes are made by SMT, the surface of strip look very good, and you don’t see any impurities and stains. However, if the strips are welding by hand, the strips will have the the mark of stains.

6. Package

Normally each 5 meters LED strip light is a roll and packed in an anti-static bag. However, in order to save the cost, many factories recycle the volume reel  and the strips are not packed in an anti-static bag. you could see from the volume reel the trace of stanines.

 7. Label

Regular Flexible LED strip light will have a printed label on the bags and roll disk instead of printing label.