Mon Prof Augmenté
Shielded Lamps and Dark Skies
Age 16 · Astronomy
Streetlights without shields send light upward, making the night sky brighter and hiding faint stars. Streetlights with flat tops and shields send light down, so the sky stays darker and more stars appear.
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Age 16: open this week
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In the picture
- Bare globe streetlamp: a round glass lamp that sends light in all directions.
- Pale sky with faint stars above the bare lamps: scattered light that hides most stars.
- Flat-topped shielded lamp: a fixture with an opaque cap and side shields.
- Downward light cone on the pavement: a bright pool where the shielded lamp aims its light.
- Dark sky with many stars above the shielded lamps: a sky where faint stars remain visible.
Examples
- A porch light that shines upward into tree branches.
- A parking lot lamp with a top cover that keeps light on the ground.
Key takeaways
- Light aimed upward scatters in the air and brightens the night sky.
- Shields direct light downward and reduce sky glow.
Quiz: Shielded Lamps and Dark Skies (Age 16)
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Which statement best explains why unshielded streetlights make faint stars harder to see?
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What is the main job of a flat top and side shields on a streetlamp?
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How does shielding streetlights help more stars become visible?
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