Why do lighthouses have red and white stripes?

Question

Why do lighthouses have red and white stripes?

This is for my 6yr olds school homework, she was given this question, Thanks for the interesting answers so far ...

Answer 1

Basically it's a universal colors to be cautious of. An aid for navigation and pilotage at sea, a lighthouse is a tower building or framework sending out light from a system of lamps and lenses or, in older times, from a fire. More primitive navigational aids were once used such as a fire on top of a hill or cliff.

Because of modern navigational aids, the number of operational lighthouses has declined to less than 1,500 worldwide. Lighthouses are used to mark dangerous coastlines, hazardous shoals away from the coast, and safe entries to harbors.

Answer 2

Lighthouses are not only used as a warning, they are often use (although not as often since GPS) to gain your bearings. Things that are on land and can be triangulated to determine your exact position (hence the phrase landmarks). The reason lighthouses are not all painted the same is because from sea it is sometimes able to see 2 lighthouses, so they are painted in different colours or different arrangements of colours. At night the rotation of the beacon is also timed to be different, One may take 58 seconds another 44, there are Admiralty charts to identify these so you can get a bearings by night. This information may be old now, and unused today but that was the original reason for the painting,

Answer 3

To make them show up. Some other lighthouses have black and white stripes while others are just plain white.

Whatever the colour, the idea is to make them highly visible against their background. Red is often chosen because not many natural things are bright red while white is an obvious choice as a bright colour that is likely to stand out and if used with red or black provides the maximum contrast to give the highest impact and visibility.

Stripes are often used to make things highly visible (eg. pedestrian crossings, safety barriers and so on) and this is even used in nature (wasps and bees often have black and yellow stripes as a warning to predators).

The reason stripes stand out is that the eye is drawn to "hard edges" and contrasts so the sudden change between, say, red and white is most likely to catch the eye.

Answer 4

If we have two contrasting colours they will be visible against any background.You need not change the colour of the lighthouse even if the background is changed subsequently..
Another advantage is, while the black or red will be visible during day, white will be more visible during nights.

Answer 5

Not all lighthouse have red and white stripes, It depends on the height, better for planes to see in daylight hours.......

Answer 6

They are easier to spot during fog or rough weather, but the different patterns on the lighthouse all seperate lighthouses from each other.

They are called "day marks."

Answer 7

Try contacting Trinity House - they're the company which own and run UK's lighthouses and lightships.

Answer 8

While some of them do, most don't. Each lighthouse needed to be clearly identifiable to help sailors know where they were.

Answer 9

so seamen can differentiate between a white cliff and the lighthouse. Don`t see many red and white cliffs.

Answer 10

Not all of them do. Some have black and white stripes, some are solid red, and some are solid white. They paint them like that so sailors and other boats can see it during fog or bad weather.