IELTS reading detail Practice

What feature of modern LED lights makes them more 'dark-sky-friendly'?

Question type: multiple choice · Difficulty: intermediate

1. A. They use significantly less energy than older bulbs.
2. B. They are often equipped with motion sensors.
3. C. They are available in warmer colour tones with less blue light.
4. D. They are easier to install in existing fixtures.

Explanation Preview

Paragraph F directly addresses this by mentioning that 'manufacturers now offer a wide range of 'warm-white' or amber LEDs (with a colour temperature below 3000 Kelvin) that are significantly less disruptive'. While other points might be true of LEDs in general, this is the specific reason given for them being 'dark-sky-friendly'.

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