Answer: E: 120-140°.
Answer analysis: When discussing the luminous angle of high-power LED imitation lumen lamp beads, we need to consider their design features and application scenarios. High-power LEDs are usually used in situations that require high brightness and wide lighting coverage, and the imitation lumen design means that its luminous characteristics may be similar to traditional lumen tubes, but with the high efficiency and long life of LEDs.
Now, let's analyze one by one according to the given options:
A: 15-20°: This range is usually associated with highly concentrated LED lamp beads and may not be applicable to high-power imitation lumen lamp beads, because such lamp beads usually require a wider light distribution.
B: 90°: A single angle value may not be sufficient to describe the luminous characteristics of high-power imitation lumen lamp beads, because their luminous angle may be wider.
C: 90-120°: This range is relatively wide and may be applicable to some high-power LED lamp beads that require medium to wide light distribution. However, for imitation lumen lamp beads, this range may still be narrow.
D: 120°: While this angle may work for some LED lamp beads, it may not be enough for high-power imitation lumen lamp beads to cover the wide lighting area required.
E: 120-140°: This range is closer to the light-emitting angle that high-power imitation lumen lamp beads may have. Since imitation lumen designs are designed to provide lighting effects similar to traditional lumen tubes, they usually require a wider light distribution to cover a larger area.
F: 30-60°: This range is relatively narrow and may not be suitable for high-power imitation lumen lamp beads that require wide lighting coverage.
Taking the above factors into consideration, the light-emitting angle of high-power imitation lumen lamp beads usually needs to be wide enough to cover a large lighting area. Therefore, option E (120-140°) best matches the common light-emitting angle range of high-power imitation lumen lamp beads.
So, the correct answer is E: 120-140°.