environment light pollution

Environment Light Pollution

PRIYADHARSHINI.M.,MCA


Show why astronomers are concerned and involved. Show what the problems are, with examples. Present some solutions to the problems. Ruin your view of the illuminated nightscape, forever!

Objectives of This Presentation


The basic problem: Sky Glow Light from fixtures reflects

off particles in the sky—”Sky Glow.”

Large cities visible from tens of miles.

The stars are not brighter in the country—the sky is darker!


A related problem: Glare Light directly

seen from fixture is called “glare”

Headlights are a familiar example.

This … is glare Sadly, equated

with good lighting!


Light pollution Any adverse effect of artificial light

Sky glow Glare Light trespass Light clutter Decreased visibility at night

What’s light pollution?


Where would you really want to live


85 Montauk “Carriage Light” Conversions

Bulb moved up under opaque cap

The Long Island Manufacturer, Magniflood,

re-designed their own fixture


Reduction of 100 watts each fixture gives better illumination Light bulb recessed into cap conceals glare Headlights able to light pedestrians in the center of the road Reduction of glare, light trespass, and skyglow


sunrise sunsetNatural night sky

light pollution

Compare Lighting from Natural and Artificial

Sources“ what the critters see ”

I. Introduction