Answer: B. 3000K-5000K.
Answer analysis: The color temperature of LED lights is an important parameter that determines the color feeling presented by the light. The unit of color temperature is Kelvin (K). The lower the value, the warmer the light is (such as yellow or red); the higher the value, the cooler the light is (such as blue or white).
Now, let's analyze the color temperature range represented by each option one by one:
A. 1000K-3000K: This range is generally considered to be the range of warm tones, including colors from deep red to warm yellow. However, although LED lights can produce such color temperatures, this is not its most common color temperature range.
B. 3000K-5000K: This range covers from warm white to neutral white light. This is a very common color temperature range in LED lights and is suitable for a variety of lighting needs, such as homes, offices, and commercial places.
C. 5000K-7000K: This range is biased towards cool white tones and is often used in situations that require higher brightness and clarity, such as hospitals, factories, or places where details need to be emphasized. Although LED lights can produce such color temperatures, it is not the most common application range.
D. 7000K-10000K: This range belongs to a very cool white tone, close to the color of daylight. Although LED lights can produce such high color temperature light, it is not common in general lighting applications.
Considering the common applications and needs of LED lights, as well as the characteristics of each color temperature range, we can conclude that the most common and widely used color temperature range of LED lights is 3000K-5000K. The light in this range is neither too warm yellow nor too cold white, which can well meet most lighting needs.
Therefore, the correct answer is B. 3000K-5000K.